CN-120854046-B - High flame-retardant cable

Abstract

The invention relates to the technical field of cables. The high-flame-retardant cable comprises a cable core and a plurality of flame-retardant mechanisms arranged outside the cable core at intervals along the length direction, wherein filling strips are arranged between every two adjacent flame-retardant mechanisms, the flame-retardant mechanisms and the filling strips are wrapped outside the cable core through strapping tapes, an outer sheath layer is arranged outside the strapping tapes, an elastic opening assembly is arranged between every two adjacent flame-retardant strips, the elastic opening assembly can be stored between the flame-retardant strips before a pressing ring is blown, can be opened along with the tilting action of the flame-retardant strips after the pressing ring is blown, and can continuously apply thrust to the flame-retardant strips, and the elastic opening assembly can partially fill the space between the adjacent flame-retardant strips after the flame-retardant strips are completely tilted. According to the invention, after the sheath layer and the strapping tape of the cable are burnt, the flame-retardant strip of the flame-retardant mechanism can be tilted more rapidly and stably under the assistance of the elastic stretching assembly to form the flame-retardant disc, so that the response speed is improved, and the fire point is prevented from spreading along the length direction of the cable.

Inventors

• ZHANG ZHIXIAN

Assignees

• 无锡洪都电缆材料有限公司

Dates

Publication Date

20260512

Application Date

20250717

Claims (5)

1. 1. The high-flame-retardance cable comprises a cable core and a plurality of flame-retardance mechanisms (1) which are arranged outside the cable core at intervals along the length direction, wherein filling strips are arranged between the adjacent flame-retardance mechanisms (1), the flame-retardance mechanisms (1) and the filling strips are wrapped outside the cable core through strapping tapes (2), and an outer sheath layer (3) is arranged outside the strapping tapes (2); The flame-retardant mechanism (1) comprises a lantern ring (4) sleeved outside the cable core and a plurality of elastic flame-retardant strips (5) arranged on the peripheral surface of the lantern ring (4), wherein one end of each flame-retardant strip (5) is fixedly connected with the lantern ring (4), and the other end of each flame-retardant strip is pressed against the lantern ring (4) through a pressing ring (6) sleeved outside the lantern ring (4); The flame-retardant device is characterized in that an elastic opening assembly is arranged between two adjacent flame-retardant strips (5), and can be contained between the flame-retardant strips (5) before the pressing ring (6) is blown, and can be opened along with the tilting action of the flame-retardant strips (5) and continuously apply thrust to the flame-retardant strips (5) after the pressing ring (6) is blown; The elastic opening assembly comprises a metal elastic sheet (7), wherein the metal elastic sheet (7) is bent to be U-shaped and is clamped between flame-retardant strips (5), two ends of the metal elastic sheet (7) are respectively and movably connected with the side walls of the flame-retardant strips (5), spherical shells (8) are arranged at two ends of the metal elastic sheet (7), a ball head (9) is arranged on the side walls of the flame-retardant strips (5), and the metal elastic sheet (7) is clamped on the ball head (9) through the spherical shells (8) to form hinge joint with the flame-retardant strips (5); Each group of elastic opening assemblies comprises a plurality of metal elastic sheets (7), the metal elastic sheets (7) are arranged along the length direction of the flame-retardant strip (5), and the U-shaped formed by bending is sleeved step by step along the length direction of the flame-retardant strip (5); The flame-retardant strip (5) is a stamping part, stepped mounting grooves (10) are stamped on two sides of the flame-retardant strip (5), and a ball head (9) on the flame-retardant strip (5) is arranged in the mounting grooves (10); the flame-retardant metal shell comprises a flame-retardant strip (5) and a pressing ring (6), wherein end grooves (11) for placing the pressing ring (6) are formed in the surface of one end of the flame-retardant strip (5) opposite to the pressing ring in a punching mode, the positions of the end grooves (11) are close to the positions of two ends of the longest metal shell fragment (7), a convex strip (12) is arranged in the center of the metal shell fragment (7), and in a storage state of the metal shell fragment (7), the middle part of each metal shell fragment (7) is pressed by the convex strip (12) on the adjacent metal shell fragment (7).
2. 2. The high-flame-retardant cable according to claim 1, wherein the cable core comprises at least three cable cores (13), the cable cores (13) are uniformly distributed in a ring shape around the center of the cable core, the cable cores (13) comprise conductive core materials, and an insulating layer, a shielding layer and an inner sheath layer which are sequentially sleeved outside the conductive core materials from inside to outside, and a filling area is formed in the area, outside the cable cores (13), of the cable core.
3. 3. The high-flame-retardant cable according to claim 2, wherein a rubber supporting framework (14) is arranged in the middle of the cable core along the length direction of the cable core, a plurality of supporting grooves (15) corresponding to the wire cores (13) are uniformly distributed on the rubber supporting framework (14) in a ring shape, and the wire cores (13) are positioned in the supporting grooves (15).
4. 4. A high flame retardant cable according to claim 3, wherein a central hole (16) extending along the length direction of the rubber support frame (14) is arranged in the middle of the rubber support frame (14), a thermal expansion filler (17) is arranged in the central hole (16), and an expansion port (18) communicated with the support groove (15) is arranged on the wall of the central hole (16) opposite to the support groove (15).
5. 5. The high-flame-retardant cable according to claim 4, wherein a supporting pad (19) is arranged between the bottom of the cable core (13) and the bottom of the supporting groove (15), the width of the supporting pad (19) is matched with that of the supporting groove (15), the surface of the supporting pad (19) is provided with an arc-shaped surface matched with the radian of the surface of the cable core (13), and the area between the adjacent supporting grooves (15) and the area, close to the surface of the cable core, in the supporting groove (15) are provided with flame-retardant fillers (20).

Description

High flame-retardant cable Technical Field The invention relates to the technical field of cables, in particular to a high-flame-retardance cable. Background The flame-retardant cable is characterized in that the flame is delayed to spread along the cable so as not to expand a fire disaster, and the flame spread on the cable is only in a limited range and can be extinguished by itself after the flame is burnt under the specified test condition and the fire source is removed. It generally employs flame retardant materials as insulation and jacket, and sometimes adds flame retardant filler or wrapped flame retardant tape to the cable structure. Compared with the common cable, the flame-retardant cable can effectively inhibit flame propagation when a fire disaster occurs, reduce the generation of smoke and toxic gas, and strive for more time for personnel evacuation and fire rescue. The traditional flame-retardant cable mainly improves the flame retardance through the material improvement of the filler layer and the flame-retardant layer, but the research and development time of the traditional flame-retardant cable is long and limited by the original characteristics of various materials, so that the research and development progress is not ideal. For this reason, some technicians have improved the overall flame retardant characteristics of the cable by physically isolating the fire point by modifying the physical structure of the cable. The low-smoke halogen-free flame-retardant cable comprises a functional protection component, wherein the functional protection component comprises a circular ring and a plurality of elastic plates on the circular ring, the elastic plates are sleeved on the circular ring through rubber rings, after the partial outer sheath and binding belts of the cable are burnt out, the elastic plates of the functional protection component can be tilted under the action of self elasticity along with the burning out of the rubber rings, and a disc-like flame-retardant disc is formed on the peripheral surface of the cable after the elastic plates are tilted, so that the flame-retardant disc absorbs high temperature and insulates the spread of fire, and the ignition point is prevented from extending along the length direction of the cable. Such cables, by virtue of their special design of functional protective components, have greatly improved flame retardant properties, but still suffer from the following drawbacks: As shown in fig. 1 (a simplified schematic diagram of the cable), the length of the elastic plate is limited, and only a small-sized fire-isolating and flame-retardant disc can be constructed, when the length of the elastic plate is increased, the larger the distance from the axis of the cable is, the larger the gap (0 in fig. 1) between the elastic plates is, no filling is performed, and effective isolation of fire cannot be realized. In order to ensure a rapid and stable spring-up of the elastic plate, the elasticity of the elastic plate itself has to be increased by improving the material of the elastic plate or the thickness thereof has to be increased. The improvement of the material is not the first work, but under the condition of increasing the thickness, the local (the part provided with the circular ring and the elastic plate) outer diameter is increased, so that the coating difficulty of the outer layer material (an outer sheath, a binding belt and the like) is obviously increased or more filler is required to be filled in order to maintain the consistency and the plumpness of the overall shape of the cable in the length direction, which all cause obstruction to the practical application of the low-smoke halogen-free flame-retardant cable. Disclosure of Invention The invention aims to provide a high-flame-retardance cable with high flame-retardance response speed. The technical scheme adopted by the invention is that the high-flame-retardant cable comprises a cable core and a plurality of flame-retardant mechanisms which are arranged outside the cable core at intervals along the length direction, wherein filling strips are arranged between the adjacent flame-retardant mechanisms; The flame-retardant mechanism comprises a lantern ring sleeved outside the cable core and a plurality of elastic flame-retardant strips arranged on the peripheral surface of the lantern ring, wherein one end of each flame-retardant strip is fixedly connected with the lantern ring, and the other end of each flame-retardant strip is pressed against the lantern ring through a pressing ring sleeved outside the lantern ring; an elastic opening assembly is arranged between two adjacent flame-retardant strips, the elastic opening assembly can be stored between the flame-retardant strips before the pressing ring is blown, can be opened along with the tilting action of the flame-retardant strips after the pressing ring is blown, and can continuously apply thrust to the flame-retardant strips, and the ela