Flame-retardant cable

Abstract

The utility model discloses a flame-retardant cable, and relates to the technical field of cables. The cable comprises an inner sleeve layer, a plurality of wire cores are arranged in the inner sleeve layer, a first filling cavity is formed between the inner sleeve layer and the plurality of wire cores, and the first filling cavity is filled with rock wool; the flame-retardant layer is arranged on the inner sleeve layer, the flame-retardant layer comprises two crosslinked polyethylene pipes arranged from inside to outside, a second filling cavity is formed between the two crosslinked polyethylene pipes, the second filling cavity is filled with glass wool, and a pressure reduction layer is arranged between the crosslinked polyethylene pipe located on the inner layer and the inner sleeve layer; the outer sleeve layer is arranged on the outer surface of the flame-retardant layer; the rock wool and the glass wool form an inner layer and an outer layer for flame retardance, the rock wool and the glass wool both have buffering and pressure reducing effects, the crosslinked polyethylene pipe, the pressure reducing layer and the jacket layer play a role in pressure resistance, pressure reduction and protection on the cable, and therefore the working stability of the cable is ensured.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a flame retardant cable. Background Art

[0002] Cable is made of one or more mutually insulated conductors and an outer insulating protective layer. Cable is one of the indispensable tools in the process of power transportation. Cable has the characteristics of internal power supply and external insulation. Cables include power cables, control cables, compensation cables, shielded cables, high temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, flame-retardant cables, etc.

[0003] Flame-retardant cables generally use a jacket made of flame-retardant material to wrap the wire core. Although it has a flame-retardant effect, the jacket is easily damaged when subjected to large shear force and external pressure, resulting in ineffective flame retardancy, affecting the working stability of the cable and easily causing unsafe factors. Therefore, the present application proposes a flame-retardant cable. Utility Model Content

[0004] The purpose of the present application is to provide a flame retardant cable to solve the problem that the existing flame retardant cables have poor compression and shear resistance and their outer jackets are easily damaged, resulting in poor flame retardant performance.

[0005] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0006] A flame retardant cable, comprising:

[0007] An inner sleeve layer, wherein a plurality of wire cores are arranged in the inner sleeve layer, a first filling cavity is formed in the inner sleeve layer and between the plurality of wire cores, and the first filling cavity is filled with rock wool;

[0008] A flame retardant layer is arranged on the inner sleeve layer, the flame retardant layer comprises two cross-linked polyethylene tubes arranged from the inside to the outside, a second filling cavity is provided between the two cross-linked polyethylene tubes, the second filling cavity is filled with glass wool, and a decompression layer is provided between the inner cross-linked polyethylene tube and the inner sleeve layer;

[0009] The outer layer is arranged on the outer surface of the flame retardant layer.

[0010] Furthermore, a spiral steel bar is arranged between the two cross-linked polyethylene tubes, which is used to form the second filling cavity into a spiral cavity, and the glass wool is filled in the spiral cavity.

[0011] Furthermore, the pressure relief layer includes a plurality of first arch strips, which are all arranged on the outer surface of the inner sleeve layer and distributed in a ring shape. The inner wall of the cross-linked polyethylene tube located in the inner layer is provided with a plurality of second arch strips distributed in a ring shape, and the plurality of first arch strips are respectively staggered with the plurality of second arch strips.

[0012] Furthermore, the first arch strip and the second arch strip are both provided with pressure relief holes distributed along the length direction thereof.

[0013] Furthermore, an inner core frame is arranged in the inner sleeve layer, the longitudinal section of the inner core frame is cross-shaped, the four ends of the inner core frame are all in contact with and overlap the inner wall of the inner sleeve layer, and a plurality of wire cores are respectively located in a plurality of angles of the inner core frame.

[0014] Furthermore, the four ends of the inner core frame are connected with arc blocks, and the outer arc surfaces of several arc blocks are overlapped with the inner wall of the inner sleeve layer.

[0015] Furthermore, spiral grooves are provided on opposite sides of the two cross-linked polyethylene tubes, and the spiral steel bars are clamped in the two spiral grooves.

[0016] Furthermore, the outer jacket layer includes a metal mesh layer and a nitrile rubber layer which are distributed inside and outside.

[0017] The beneficial effects of this application are as follows:

[0018] In the present application, rock wool and glass wool form a double flame retardant layer inside and outside, and both have a buffering and decompression effect. The cross-linked polyethylene tube, the decompression layer and the outer jacket layer play a role in pressure resistance and decompression protection for the cable, thereby ensuring the working stability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of this application;

[0020] Figure 2 It is a sectional view of the three-dimensional structure of the present application;

[0021] Figure 3 It is another three-dimensional structural cross-sectional view of the present application;

[0022] Figure 4 This application Figure 2 Enlarged view of point A in the middle;

[0023] Figure numerals: 1, inner layer; 2, wire core; 3, rock wool; 4, flame retardant layer; 5, pressure relief layer; 6, outer layer; 7, spiral steel bar; 8, pressure relief hole; 9, inner core frame; 10, arc block; 401, cross-linked polyethylene tube; 402, glass wool; 501, first arch bar; 502, second arch bar; 601, metal mesh layer; 602, nitrile rubber layer. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0025] like Figure 1-Figure 4 As shown, a flame-retardant cable proposed in one embodiment of the present application includes:

[0026] An inner jacket 1, wherein a plurality of wire cores 2 are arranged in the inner jacket 1, a first filling cavity is formed in the inner jacket 1 and between the plurality of wire cores 2, and the first filling cavity is filled with rock wool 3, which is an inorganic fiber made by high-temperature melting and fiberization, is not easy to burn, does not release heat and toxic smoke, can effectively cut off the spread of flames in the event of a fire, and has a good flame retardant effect. At the same time, its porous structure has a good buffering and decompression performance;

[0027] The flame retardant layer 4 is arranged on the inner sleeve layer 1. The flame retardant layer 4 includes two cross-linked polyethylene tubes 401 arranged from the inside to the outside. The vinyl of silane is grafted with polyethylene through the action of an initiator such as peroxide to generate a polymer containing trimethylsilyl groups. After hydrolysis, silanol groups are formed. Then, cross-linking is generated through the polycondensation reaction of the silanol groups to generate cross-linked polyethylene. The cross-linked polyethylene has good pressure resistance, can be bent arbitrarily, is not easy to be brittle, and has high creep resistance. There is a second filling cavity between the two cross-linked polyethylene tubes 401. The second filling cavity is filled with glass wool 402. The glass wool 402 is formed by fiberizing molten glass to form cotton. The material is a kind of man-made inorganic fiber. The glass wool 402 is an A1 grade non-combustible material with good flame retardant effect. At the same time, it also has a buffering and decompression effect. The glass wool 402 is flame retardant, and the two cross-linked polyethylene tubes 401 protect the glass wool 402, so that the cable as a whole has good flame retardant effect and good pressure resistance. A decompression layer 5 is arranged between the inner cross-linked polyethylene tube 401 and the inner jacket layer 1. Through the decompression layer 5, when the cable is subjected to large shear force and pressure, it can effectively reduce pressure, further improving the overall compressive resistance of the cable;

[0028] The outer jacket layer 6 is arranged on the outer surface of the flame retardant layer 4, and the outer jacket layer 6 is used to protect the flame retardant layer 4 to further ensure the flame retardant performance of the cable;

[0029] The overall structure of the cable, rock wool 3 and glass wool 402 form an inner and outer double layer of flame retardant, the cross-linked polyethylene tube 401, the pressure relief layer 5 and the outer jacket layer 6 play a role in pressure resistance and pressure relief protection for the cable, thereby ensuring the working stability of the cable.

[0030] like Figure 4 As shown, in some embodiments, a spiral steel bar 7 is arranged between two cross-linked polyethylene tubes 401, which is used to form the second filling cavity into a spiral cavity, and the glass wool 402 is filled in the spiral cavity. Through the arranged spiral steel bar 7, when the cable as a whole is under pressure, the pressure will be transmitted to the spiral steel bar 7. Since the spiral steel bar 7 is spirally wound and affected by the extrusion force, the spiral structure of the spiral steel bar 7 will produce circumferential tensile stress, thereby dispersing the pressure at the pressure point and improving the compressive performance of the cable.

[0031] like Figure 3 As shown, in some embodiments, the pressure relief layer 5 includes a plurality of first arch strips 501, which are all arranged on the outer surface of the inner sleeve layer 1 and are distributed in a ring shape, and the inner wall of the cross-linked polyethylene tube 401 located in the inner layer is provided with a plurality of second arch strips 502 distributed in a ring shape, and the plurality of first arch strips 501 are staggered with the plurality of second arch strips 502 respectively. When the cable is under pressure, the pressure will be transmitted to the first arch strips 501 and the second arch strips 502. The first arch strips 501 and the second arch strips 502 have an arched structure and a pressure relief gap between them, which can effectively buffer and reduce the pressure, thereby further improving the overall pressure resistance of the cable.

[0032] like Figure 3 As shown, in some embodiments, the first arch bar 501 and the second arch bar 502 are both provided with pressure relief holes 8 distributed along their length direction. The pressure relief holes 8 are opened to further increase the pressure relief space, improve the pressure relief effect, and reduce stress concentration to a certain extent, thereby further improving the compressive resistance of the cable.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, an inner core frame 9 is provided in the inner jacket 1, and the longitudinal section of the inner core frame 9 is cross-shaped. The four ends of the inner core frame 9 are all in contact with and overlapped with the inner wall of the inner jacket 1, and a plurality of cores 2 are respectively located in a plurality of angles of the inner core frame 9. Preferably, the inner core frame 9 adopts aerogel. Aerogel refers to a nano-scale porous solid material formed by a sol-gel method in which a gas replaces a liquid phase in a gel in a certain drying manner. The aerogel is very strong and durable, and has good compression resistance, torsion resistance and bending resistance. At the same time, the aerogel is light in weight. In addition, its thermal conductivity and refractive index are also very low, and its insulation ability is good. It supports the inner jacket 1 and reduces the pressure transmitted to the core 2, which can further improve the compressive performance of the cable.

[0034] like Figure 1 As shown, in some embodiments, the four ends of the inner core frame 9 are connected to arc blocks 10, and the outer arc surfaces of several arc blocks 10 overlap the inner wall of the inner sleeve layer 1. The arc blocks 10 are provided to increase the contact area between the ends of the inner core frame 9 and the inner sleeve layer 1, avoid stress concentration, and thus improve practicality.

[0035] like Figure 4As shown, in some embodiments, spiral grooves are opened on opposite sides of the two cross-linked polyethylene tubes 401, and the spiral steel bar 7 is stuck in the two spiral grooves. Preferably, the spiral groove has a certain depth. After the spiral steel bar 7 is stuck in the spiral groove, there is a gap between its end face and the inner wall of the spiral groove. When under pressure, the spiral steel bar 7 will produce annular tensile stress, and it will produce axial contraction deformation. By opening the spiral groove, deformation space is provided for the spiral steel bar 7 to further improve the overall compressive resistance of the cable.

[0036] like Figure 1 and Figure 3 As shown, in some embodiments, the outer jacket layer 6 includes a metal mesh layer 601 and a nitrile rubber layer 602 distributed inside and outside. The metal mesh layer 601 is spirally wound on the outer surface of the flame retardant layer 4 and has good anti-slip and cutting properties. It is used to protect the flame retardant layer 4. Nitrile rubber is a type of synthetic rubber made from butadiene and acrylonitrile by emulsion polymerization. It has good wear resistance and flame retardant effect, which further improves the service life of the cable.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flame retardant cable, characterized in that: include: An inner sleeve layer (1), wherein a plurality of wire cores (2) are arranged in the inner sleeve layer (1), a first filling cavity is formed in the inner sleeve layer (1) and between the plurality of wire cores (2), and the first filling cavity is filled with rock wool (3); A flame retardant layer (4) is arranged on the inner sleeve layer (1), the flame retardant layer (4) comprising two cross-linked polyethylene tubes (401) arranged from the inside to the outside, a second filling cavity is provided between the two cross-linked polyethylene tubes (401), the second filling cavity is filled with glass wool (402), and a pressure relief layer (5) is provided between the inner cross-linked polyethylene tube (401) and the inner sleeve layer (1); The outer jacket layer (6) is arranged on the outer surface of the flame retardant layer (4).

2. The flame-retardant cable according to claim 1, characterized in that: A spiral steel bar (7) is arranged between the two cross-linked polyethylene tubes (401) and is used to form the second filling cavity into a spiral cavity, and the glass wool (402) is filled in the spiral cavity.

3. The flame-retardant cable according to claim 1, characterized in that: The pressure relief layer (5) comprises a plurality of first arch strips (501), which are arranged on the outer surface of the inner sleeve layer (1) and are distributed in an annular shape. The inner wall of the cross-linked polyethylene tube (401) located in the inner layer is provided with a plurality of second arch strips (502) distributed in an annular shape. The plurality of first arch strips (501) are respectively distributed in an alternating manner with the plurality of second arch strips (502).

4. The flame-retardant cable according to claim 3, characterized in that: The first arch strip (501) and the second arch strip (502) are both provided with pressure relief holes (8) distributed along their length direction.

5. The flame-retardant cable according to claim 1, characterized in that: An inner core frame (9) is arranged inside the inner sleeve layer (1), the longitudinal section of the inner core frame (9) is cross-shaped, the four ends of the inner core frame (9) are all in contact with and overlap the inner wall of the inner sleeve layer (1), and a plurality of wire cores (2) are respectively located in a plurality of angles of the inner core frame (9).

6. The flame-retardant cable according to claim 5, characterized in that: The four ends of the inner core frame (9) are all connected to arc blocks (10), and the outer arc surfaces of a plurality of arc blocks (10) are overlapped with the inner wall of the inner sleeve layer (1).

7. The flame-retardant cable according to claim 2, characterized in that: The two cross-linked polyethylene tubes (401) are provided with spiral grooves on opposite sides, and the spiral steel bars (7) are clamped in the two spiral grooves.

8. The flame-retardant cable according to claim 1, characterized in that: The outer shell layer (6) comprises a metal mesh layer (601) and a nitrile rubber layer (602) which are distributed inside and outside.

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