CN114864158B

CN114864158B - B1-grade flame-retardant cable

Info

Publication number: CN114864158B
Application number: CN202210797700.2A
Authority: CN
Inventors: 张晓欢; 苏运成; 盛俊凯; 李广波
Original assignee: Jianye Cable Group Co ltd
Current assignee: Jianye Cable Group Co ltd
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2022-09-09
Anticipated expiration: 2042-07-08
Also published as: CN114864158A

Abstract

The application provides a B1 level flame retardant cable, belongs to the cable field. The B1-grade flame-retardant cable comprises an outer sheath, a plurality of flame-retardant wire core thermal deformation pieces and a tensile rope. The outer sheath is made of flame-retardant materials and is flat, and the corner of the side wall is provided with an inward bending part; the plurality of flame-retardant wire cores are arranged in the outer sheath and arranged along the long axis of the outer sheath; the thermal deformation piece is arranged along the inner wall of the inward bending part and is suitable for expanding the inward bending part after being heated; the tensile rope has the electric heat effect, locate in the inflexion portion and with heat altered shape heat conduction connection, be suitable for heating thermal deformation spare, adopt tensile rope ohmic heating thermal deformation spare, make full use of the original structure of cable, thermal deformation spare receives the inflexion portion of thermal deformation with the oversheath to strut, make oversheath inner space grow, the lateral wall separates with the sinle silk, the resistance of taking out of sinle silk reduces, thereby can be convenient take out the fire-retardant sinle silk that damages, and penetrate new fire-retardant sinle silk, can realize the change of single sinle silk, need not to change whole cable, and the cost is reduced.

Description

B1-grade flame-retardant cable

Technical Field

The application belongs to the technical field of cables, and particularly relates to a B1-grade flame-retardant cable.

Background

A conventional cable generally has a plurality of cores built therein to transmit various currents or signals. However, when a core of the cable is damaged, the entire cable needs to be replaced, so that other intact cores are discarded at the same time, and waste is caused. And the flame-retardant cable is higher in cost, so that the maintenance cost of an enterprise is higher due to the fact that the whole cable is directly replaced.

Disclosure of Invention

In view of this, the embodiment of the present application provides a B1-grade flame retardant cable, so as to solve the technical problem in the prior art that the entire cable needs to be replaced after a cable core is damaged.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: provided is a B1-grade flame-retardant cable, comprising:

the outer sheath is made of flame-retardant materials and is flat, and an inward-bent part is arranged at the corner of the side wall;

the flame-retardant wire cores are arranged in the outer sheath and are arranged along the long axis of the outer sheath;

the thermal deformation piece is arranged along the inner wall of the inward bending part and is suitable for expanding the inward bending part after being heated;

the tensile rope has an electric heating effect, is arranged in the inward-bending part, is in heat conduction connection with the thermal deformation part, and is suitable for heating the thermal deformation part.

In certain embodiments, the thermal deformation comprises:

the passive layer is arranged along the inner wall of the inward bending part; and

the active layer is stacked on one side, back to the inner wall of the inward bending part, of the passive layer and is in heat conduction connection with the tensile rope, corresponding end parts of the passive layer and the active layer are fixed, and the thermal expansion coefficient of the active layer is larger than that of the passive layer;

the tensile rope is attached to the active layer.

In some embodiments, a plurality of thermally deformable members are spaced within the inturned portion in the axial direction of the cable.

In some embodiments, a heat insulation layer is arranged between the inward bending part and the adjacent flame-retardant wire core.

In certain embodiments, an open constriction of the inflected section traps the tensile strand within the inflected section.

In certain embodiments, the outer sheath is a flattened rectangle comprising:

the two wide walls are oppositely and parallelly arranged in a separated way, and the middle part of the two wide walls is provided with a plurality of flame-retardant wire cores; and

the two narrow walls are respectively connected between the corresponding end parts of the two wide walls, and the two wide walls are pulled to clamp the plurality of flame-retardant wire cores in the middle;

the inner bent portion is provided at each connection of the wide wall and the narrow wall.

In some embodiments, the inner side of the wide wall is provided with a separating part embedded between two adjacent flame-retardant wire cores.

In some embodiments, two wide walls of the outer sheath are provided with opposite perforations, and the perforations are opposite to the gaps between the adjacent flame-retardant wire cores; the B1 level flame-retardant cable further comprises a pulling piece penetrating between the adjacent flame-retardant wire cores, two ends of the pulling piece respectively penetrate through the opposite through holes and pull the two wide walls, and the pulling piece is detachably arranged.

In certain embodiments, the tensile strand is a steel cord.

In some embodiments, the flame-retardant core is wrapped with a flame-retardant layer, and the outer sheath is made of a flame-retardant material.

The B1 level flame retardant cable that this application embodiment provided's beneficial effect lies in: compared with the prior art, the B1 level flame retardant cable of this application embodiment, adopt tensile rope ohmic heating thermal deformation spare, make full use of the original structure of cable, thermal deformation spare receives the internal curvature portion of heat altered shape with the oversheath to strut, make the oversheath inner space grow, the lateral wall separates with the sinle silk, the resistance of taking out of sinle silk reduces, thereby can be convenient take out the flame-retardant sinle silk that damages, and penetrate new flame-retardant sinle silk, can realize the change of single sinle silk, need not to change whole cable, reduce cost. When the fire breaks out, thermal deformation spare also can be heated and warp, makes to form the clearance between oversheath and the fire-retardant sinle silk, also can play certain fire-retardant effect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a B1-grade flame retardant cable provided in an embodiment of the present application;

fig. 2 is an enlarged view of a point a in fig. 1.

Wherein, in the figures, the respective reference numerals:

1-an outer sheath; 11-wide wall; 12-narrow walls; 13-a partition; 14-perforating; 15-a pull; 2-an inward bend; 21-a thermal insulation layer; 3-flame retardant wire core; 4-a thermally deformable member; 41-a passive layer; 42-an active layer; 5-tensile resistance rope.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 2 together, a B1-grade flame retardant cable provided in the embodiments of the present application will now be described. A class B1 flame retardant cable comprising:

the outer sheath 1 is made of flame-retardant materials and is flat, and an inward-bent part 2 is arranged at the corner of the side wall;

the flame-retardant wire cores 3 are arranged in the outer sheath 1 and are arranged along the long axis of the outer sheath 1;

the thermal deformation piece 4 is arranged along the inner wall of the inward bending part 2 and is suitable for expanding the inward bending part 2 after being heated;

the tensile rope 5 has an electrothermal effect, is arranged in the inward bending part 2, is in heat conduction connection with the thermal deformation part 4, and is suitable for heating the thermal deformation part 4.

Compared with the prior art, the B1 level flame retardant cable of this application embodiment, adopt the 5 ohmic heating thermal deformation pieces 4 of stretch-proofing rope, make full use of the original structure of cable, thermal deformation pieces 4 are heated the thermal deformation and are propped out the interior curved part 2 of oversheath 1, make the 1 inner space grow of oversheath, the lateral wall separates with the sinle silk, the resistance of taking out of sinle silk reduces, thereby can be convenient take out the fire-retardant sinle silk 3 that damages, and penetrate new fire-retardant sinle silk 3, can realize the change of single sinle silk, need not to change whole cable, and the cost is reduced. When a fire breaks out, the thermal deformation piece 4 can be also subjected to thermal deformation, so that a gap is formed between the outer sheath 1 and the flame-retardant wire core 3, and a certain flame-retardant effect can be achieved.

When the wire core is replaced, firstly detecting and determining the damaged wire core; then, connecting two ends of the tensile rope 5 with a power supply to enable the tensile rope 5 to generate heat, and transmitting heat generated by the tensile rope 5 to the thermal deformation member 4 to enable the thermal deformation member 4 to prop open the inward bending part 2; then, fixing a pulling wire (a fish wire or a thin steel wire or the like) thinner than the damaged wire core at one end of the damaged wire core, pulling the other end of the damaged wire core, and pulling out the damaged wire core and simultaneously threading the pulling wire; and finally, fixing a replacement wire core at one end of the traction rope, pulling the other end of the traction rope, drawing out the traction rope, penetrating the replacement wire core, cutting off a power supply of the tensile rope 5, and restoring the thermal deformation piece 4 and the inward bending part 2 to finish the replacement of the wire core. And a proper amount of talcum powder can be smeared on the surface of the replacement wire core, so that the friction force during penetration is reduced.

In this embodiment, the outer sheath 1 may be made of rubber or a flame retardant material, as in the case of the conventional cable. The corner of the lateral wall of oversheath 1 inwards bends and forms sunken inflexion 2 for when inflexion 2 is in pristine condition, the lateral wall of oversheath 1 just in time with each sinle silk laminating, and when inflexion 2 expandes, the inner space of oversheath 1 can increase, makes the lateral wall of oversheath 1 and each sinle silk appear separating, reduces the resistance of taking out of sinle silk. The flame-retardant wire core 3 meets the flame-retardant requirement through the self-contained flame-retardant structure,

the flame-retardant wire cores 3 are arranged along the long axis of the outer sheath 1, so that the flame-retardant wire cores 3 are mainly fixed by being wrapped by the outer sheath 1, and the acting force between the adjacent flame-retardant wire cores 3 is small; when the inflexion part 2 is unfolded, the outer sheath 1 is separated from the wire core, the drawing resistance of the flame-retardant wire core 3 can be greatly reduced, and the resistance of the adjacent wire core can not be received.

The thermal deformation piece 4 is arranged close to the inner wall of the inward bending part 2 in the inward bending part 2, so that the deformation of the thermal deformation piece 4 can directly drive the inward bending part 2 to deform. The tensile strand 5 is arranged in close contact with the thermally deformable part 4, so that heat of the tensile strand 5 can be quickly transferred to the thermally deformable part 4. When the wire core is replaced, the temperature and the deformation of the thermal deformation piece 4 are controlled by controlling the current in the tensile rope 5. The temperature at which the thermal deformation member 4 reaches the required deformation should be less than the maximum heat-resistant temperature of the outer sheath 1 so that the outer sheath 1 is not damaged by an excessively high temperature when the thermal deformation member 4 reaches the required deformation.

Referring to fig. 2, as an embodiment of the flame retardant cable of B1 grade provided by the present application, the thermal deformation member 4 includes:

a passive layer 41 disposed along an inner wall of the inner bend 2;

the active layer 42 is stacked on one side, back to the inner wall of the inward bending part 2, of the passive layer 41, is in heat conduction connection with the tensile rope 5, corresponding end parts of the passive layer 41 and the active layer 42 are fixed, and the thermal expansion coefficient of the active layer 42 is larger than that of the passive layer 41;

the tensile strand 5 is attached to the active layer 42.

In specific implementation, initially, the thermal deformation piece 4 is attached to the inner wall of the inward bending part 2 and is arc-shaped; when the thermally deformable member 4 is heated, the elongation of the active layer 42 is greater than the elongation of the passive layer 41, so that the entire thermally deformable member 4 is gradually straightened, thereby driving the inflected section 2 to be gradually straightened.

The passive layer 41 and the active layer 42 may be made of metals with different thermal expansion coefficients, and the metals have better thermal conductivity and are easier to be deformed by heat.

As a specific embodiment of the B1-grade flame-retardant cable provided by the application, a plurality of thermal deformation pieces 4 are arranged in the inward bending part 2 at intervals in the axial direction of the cable.

In the concrete implementation, because the cable is rectangular, the inflected part 2 of each section of the cable all need be strutted to more conveniently draw out the flame-retardant core 3. The thermal deformation pieces 4 are respectively arranged on the inward bending parts 2 of the sections of the cable, so that the material of the thermal deformation pieces 4 can be saved, and the cost is reduced.

Referring to fig. 2, as a specific embodiment of the flame retardant cable of B1 grade provided by the present application, a heat insulation layer 21 is disposed between the inward bending portion 2 and the adjacent flame retardant core 3.

Every time the tensile rope 5 of the fire-retardant core 3 is replaced can generate heat, the adjacent fire-retardant core 3 can be heated, and the adjacent fire-retardant core 3 is easy to damage after the heating is repeated. In this embodiment, the heat insulating layer 21 is provided to prevent heat of the tensile cord 5 and the thermal deformation member 4 from being transferred to the flame-retardant core 3, thereby reducing the influence on the adjacent flame-retardant core 3. In a concrete implementation, the heat insulating layer 21 is attached to the outer side of the side wall of the inward bending portion 2.

Referring to fig. 2, as an embodiment of the B1 flame retardant cable provided by the present application, the opening of the inflected section 2 is shrunk to restrain the tensile strand 5 within the inflected section 2.

In this embodiment, the tensile strand 5 is prevented from escaping from the inturned portion 2. When the wire core is replaced, an electrode of a power supply can be inserted from the opening of the inward bending part 2 to be in contact with the tensile rope 5, so that the tensile rope 5 is locally electrified or wholly electrified.

Referring to fig. 1, as an embodiment of the flame retardant cable class B1 provided herein, the outer sheath 1 is a flat rectangle and includes:

the two wide walls 11 are oppositely and separately arranged in parallel, and a plurality of flame-retardant wire cores 3 are arranged in the middle; and

the two narrow walls 12 are respectively connected between the corresponding end parts of the two wide walls 11, and the two wide walls 11 are pulled to clamp the plurality of flame-retardant wire cores 3 in the middle;

the inflected section 2 is provided at each junction of the wide wall 11 and the narrow wall 12.

In this embodiment, each of the flame-retardant core wires 3 is mainly clamped and fixed by two wide walls 11. The inflected parts 2 are arranged at the connecting parts of the wide walls 11 and the narrow walls 12, and the four corners of the outer sheath 1 are provided with the inflected parts 2. When the inward bent portion 2 is spread, the distance between the two wide walls 11 is increased, so that the respective flame-retardant wire cores 3 can be easily withdrawn.

Referring to fig. 1, as a specific embodiment of the B1-grade flame-retardant cable provided by the present application, a partition 13 embedded between two adjacent flame-retardant cores 3 is disposed on the inner side of the wide wall 11.

In this embodiment, the partition 13 can fix the position of each flame-retardant core 3, preventing each flame-retardant core 3 from being dislocated. In the specific implementation, the inner side of the wide wall 11 of the sheath 1 is undulated, forming a partition 13.

Referring to fig. 1, as a specific embodiment of the B1-grade flame-retardant cable provided by the present application, two wide walls 11 of the outer sheath 1 are provided with opposite through holes 14, and the through holes 14 are opposite to gaps between adjacent flame-retardant cores 3; the B1 grade flame-retardant cable also comprises a pulling piece 15 which passes through between the adjacent flame-retardant wire cores 3, both ends of the pulling piece 15 respectively pass through the opposite through holes 14 and pull the two wide walls 11, and the pulling piece 15 is detachably arranged.

When a fire occurs, the thermal deformation piece 4 deforms to generate a gap between the wide wall 11 of the outer sheath 1 and the flame-retardant wire core 3, when the traction piece 15 is not arranged, the gap is relatively large in expansion, and when the traction piece 15 is arranged, the wide wall 11 of the outer sheath 1 is pulled by the traction piece 15, so that the gap is relatively small in expansion; by providing the outer sheath 1 with the pulling member 15, the two wide walls 11 of the outer sheath 1 can clamp the flame-retardant wire core 3 more tightly.

In a specific implementation, the through hole 14 in the wide wall 11 of the outer sheath 1 is a counter bore, and the pulling member 15 may be a bolt. When the wire core needs to be replaced, the pulling pieces 15 are detached firstly; after the sinle silk is changed and is accomplished, will pull 15 and install again, guarantee the rigidity that each fire-retardant sinle silk 3 pressed from both sides.

Referring to fig. 1 and 2, as a specific embodiment of the B1 grade flame retardant cable provided by the present application, the tensile cord 5 is a steel cord.

In this embodiment, adopt wire rope as tensile rope 5, both guaranteed intensity, also can electrically conduct generate heat.

Referring to fig. 1 and 2, as a specific embodiment of the B1-grade flame retardant cable provided by the present application, the flame retardant core 3 is coated with a flame retardant layer.

In this embodiment, the outermost layer of the flame-retardant core 3 is a flame-retardant layer, and the inside of the flame-retardant core can be wrapped with a shielding layer and the like.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

Flame-retardant cable grade B1, characterized in that it comprises:

the outer sheath is made of flame-retardant materials and is flat, and the corner of the side wall is provided with an inward bending part;

the flame-retardant wire cores are arranged in the outer sheath and are arranged along the long axis of the outer sheath;

the thermal deformation piece is arranged along the inner wall of the inward bending part and is suitable for expanding the inward bending part after being heated;

the tensile rope has an electric heating effect, is arranged in the inward bending part, is in heat conduction connection with the thermal deformation part, and is suitable for heating the thermal deformation part.
2. The flame retardant cable of claim 1, class B1, wherein the thermally deformable member comprises:

the passive layer is arranged along the inner wall of the inward bending part; and

the active layer is stacked on one side, back to the inner wall of the inward bending part, of the passive layer and is in heat conduction connection with the tensile rope, corresponding end parts of the passive layer and the active layer are fixed, and the thermal expansion coefficient of the active layer is larger than that of the passive layer;

the tensile rope is attached to the active layer.
3. The class B1 flame retardant cable of claim 1, wherein a plurality of thermally deformable members are spaced within the inturned portion in a cable axial direction.
4. The fire resistant cable of claim 1, class B1 wherein a layer of insulation is disposed between the inturned portion and the adjacent fire resistant core.
5. The class B1 flame retardant cable of claim 1, wherein an open constriction of the inturned portion traps the tensile strand within the inturned portion.
6. The class B1 flame retardant cable of claim 1, wherein the outer jacket is a flat rectangle comprising:

the two wide walls are oppositely arranged in parallel and separated, and a plurality of flame-retardant wire cores are arranged in the middle; and

the two narrow walls are respectively connected between the corresponding end parts of the two wide walls, and the two wide walls are pulled to clamp the plurality of flame-retardant wire cores in the middle;

the inner bent portion is provided at each connection of the wide wall and the narrow wall.
7. The class B1 flame retardant cable of claim 6, wherein the inner side of said broad wall is provided with a partition embedded between two adjacent flame retardant cores.
8. The class B1 flame retardant cable of claim 1, wherein opposite perforations are provided on both broad walls of said outer jacket, said perforations being opposite to the gaps between adjacent said flame retardant cores; the B1 level flame-retardant cable further comprises a pulling piece penetrating between the adjacent flame-retardant wire cores, two ends of the pulling piece respectively penetrate through the opposite through holes and pull the two wide walls, and the pulling piece is detachably arranged.
9. The class B1 flame retardant cable of claim 6, wherein the tensile strand is a steel cord.
10. The class B1 flame retardant cable of claim 1, wherein said flame retardant core is coated with a flame retardant layer.