Tensile low-smoke halogen-free cable

Abstract

The utility model discloses a tensile low-smoke halogen-free cable, and relates to the technical field of cables. The cable comprises an inner core strip, the outer surface of the inner core strip is provided with a plurality of spiral caulking grooves in an array mode, and wire cores are embedded in the spiral caulking grooves; the inner sleeve layer is arranged on the outer surfaces of the inner core strip and the multiple wire cores in a sleeving mode, spiral clamping grooves are formed in the portions, protruding out of the inner core strip, between every two adjacent wire cores, a plurality of spiral clamping strips are constructed on the inner wall of the inner sleeve layer in an array mode, and the spiral clamping strips are matched with the spiral clamping grooves in a clamped mode; the inner sleeve layer is internally provided with the inner core strip, the outer surface of the inner core strip is provided with the spiral caulking groove, the plurality of wire cores are spirally embedded in the plurality of spiral caulking grooves respectively, a spiral clamping groove is formed between every two adjacent wire cores, the inner wall of the inner sleeve layer is provided with the plurality of spiral clamping strips, and the plurality of spiral clamping strips are clamped and matched with the plurality of spiral clamping grooves respectively. Therefore, an inner-outer double-layer spiral connection structure is formed, and the overall tensile property of the cable is improved.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a tensile-resistant low-smoke halogen-free cable. Background Art

[0002] Cables are made of one or more mutually insulated conductors and an outer insulating protective layer. Cables are one of the indispensable tools in the process of power transportation. Cables have the characteristics of internal power supply and external insulation. Halogen-containing wires and cables release hydrogen halides when they are heated during combustion. Hydrogen halides can capture active free radicals OH roots, delaying or extinguishing the combustion of materials, achieving the purpose of flame retardancy, thereby reducing the emission of smoke during combustion. However, halogen-containing wires and cables will produce toxic hydrogen chloride smoke during combustion, which will cause poisoning to people after release. Therefore, halogen-free wires and cables have emerged. Halogen-free wires and cables are mainly made of polyolefin materials, which are composed of hydrocarbons. They decompose carbon dioxide and water during combustion and do not produce obvious smoke and harmful gases.

[0003] Although the existing low-smoke halogen-free cables have good flame retardant effects, they have poor tensile properties and are prone to rupture under large tensile and shear forces, which can easily cause unsafe factors and affect the working stability of the cables. Therefore, the present application proposes a tensile-resistant low-smoke halogen-free cable. Utility Model Content

[0004] The purpose of the present application is to solve the problem of poor tensile strength of existing low-smoke halogen-free cables, and to provide a tensile-resistant low-smoke halogen-free cable.

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

[0006] A tensile-resistant low-smoke halogen-free cable, comprising:

[0007] The inner core strip has a plurality of spiral grooves arranged in an array on its outer surface, and a wire core is embedded in each of the plurality of spiral grooves;

[0008] The inner sleeve layer is sleeved on the inner core strip and the outer surface of the plurality of wire cores, and a spiral groove is formed between two adjacent wire cores and the portion protruding outside the inner core strip. The inner wall array of the inner sleeve layer is structured with a plurality of spiral clamping strips, and the plurality of spiral clamping strips are respectively clamped and matched with the plurality of spiral clamping grooves;

[0009] The outer sleeve layer is sleeved on the outer surface of the inner sleeve layer.

[0010] Furthermore, a tension rod is coaxially arranged inside the inner core strip.

[0011] Furthermore, the outer surface of the anti-tension rod is arrayed with a plurality of limit plates along its length direction, and the plurality of limit plates are embedded in the inner core strip.

[0012] Furthermore, a plurality of air-permeable grooves are arranged in an array on the outer surface of the inner core strip, and the two end ports of the air-permeable grooves are respectively connected with the two end ports of the inner core strip.

[0013] Furthermore, the plurality of air-permeable grooves are respectively provided on the inner walls of the plurality of spiral embedding grooves and are distributed along the spiral direction thereof.

[0014] Furthermore, the outer jacket layer comprises a low-smoke halogen-free polyolefin layer arranged on the outer surface of the inner jacket layer, and an alumina ceramic layer is arranged on the outer surface of the low-smoke halogen-free polyolefin layer.

[0015] Furthermore, a steel bar is spirally wound between the inner sleeve layer and the low-smoke halogen-free polyolefin layer.

[0016] Furthermore, the outer wall of the inner sleeve layer and the inner wall of the low-smoke halogen-free polyolefin layer both begin to have spiral slots, and the steel bars are spirally inserted in the two spiral slots.

[0017] The beneficial effects of the present application are as follows: In the present application, an inner core strip is arranged in the inner sleeve layer, a spiral embedding groove is opened on the outer surface of the inner core strip, a plurality of wire cores are spirally embedded in the plurality of spiral embedding grooves respectively, a spiral clamping groove is formed between two adjacent wire cores, a plurality of spiral clamping strips are arranged on the inner wall of the inner sleeve layer, and the plurality of spiral clamping strips are respectively matched with the plurality of spiral clamping grooves to form an inner and outer double-layer spiral connection structure, thereby improving the overall tensile performance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of this application;

[0019] Figure 2 It is a sectional view of the three-dimensional structure of the present application;

[0020] Figure 3 It is another three-dimensional structural cross-sectional view of the present application;

[0021] Figure 4 It is an exploded view of some three-dimensional structures of this application;

[0022] Figure 5 This application Figure 2 Enlarged view of point A in the middle;

[0023] Figure numerals: 1, inner core strip; 2, spiral embedded groove; 3, wire core; 4, inner sleeve layer; 5, spiral clamping strip; 6, outer sleeve layer; 7, tension rod; 8, limit plate; 9, ventilation groove; 10, steel bar; 11, spiral slot; 601, low-smoke halogen-free polyolefin layer; 602, alumina ceramic 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 5 As shown, a tensile-resistant low-smoke halogen-free cable proposed in one embodiment of the present application includes:

[0026] The inner core strip 1 has a plurality of spiral grooves 2 arranged in an array on its outer surface, and a wire core 3 is embedded in each of the plurality of spiral grooves 2. Preferably, the inner core strip 1 is made of styrene-butadiene rubber, which is a synthetic general-purpose rubber with properties similar to natural rubber. It is a low-cost polymer with excellent impact resistance and tensile strength, as well as good resilience, insulation and low-temperature flexibility. By using styrene-butadiene rubber as the inner core strip 1, a spiral groove 2 is formed on its outer surface, and the wire cores 3 are respectively clamped in the spiral grooves 2, which separates the plurality of wire cores 3, and improves the connection performance between the inner core strip 1 and the wire core 3 through the spiral grooves 2, thereby improving the tensile performance;

[0027] The inner jacket layer 4 is sleeved on the outer surface of the inner core strip 1 and the plurality of wire cores 3. A spiral groove is formed between two adjacent wire cores 3 and the part protruding outside the inner core strip 1. The inner wall array of the inner jacket layer 4 is constructed with a plurality of spiral clamping strips 5. The spiral clamping strips 5 are made of styrene-butadiene rubber. The plurality of spiral clamping strips 5 are respectively clamped with the plurality of spiral clamping grooves. When the plurality of wire cores 3 are respectively clamped in the plurality of spiral embedding grooves 2, the inner jacket layer 4 is sleeved. The plurality of spiral clamping strips 5 are respectively clamped with the spiral clamping grooves formed between two adjacent wire cores 3. The plurality of spiral clamping strips 5 are not only used to fill the gap between the inner jacket layer 4 and the wire cores 3, but also the spiral clamping structure of the spiral clamping groove and the spiral clamping strip 5 further improves the connectivity between the inner jacket layer 4, the inner core strip 1 and the wire core 3, thereby improving the tensile performance of the cable.

[0028] The outer jacket layer 6 is sleeved on the outer surface of the inner jacket layer 4, and the outer jacket layer 6 is used to protect the inner jacket layer 4;

[0029] The overall structure of the cable is that the inner core strip 1 and the wire core 3 are connected by a spiral clamping structure, and the inner sleeve layer 4 is connected to the inner core strip 1 and the wire core 3 by a spiral clamping structure, thereby improving the connectivity among the three, and the double-layer spiral connection structure improves the overall tensile performance of the cable.

[0030] like Figure 1 , Figure 2 and Figure 4As shown, in some embodiments, a tensile rod 7 is coaxially arranged in the inner core strip 1. Preferably, the tensile rod 7 is made of aerogel. Aerogel refers to a nano-scale porous solid material formed by replacing the liquid phase in the gel with gas through a sol-gel method in a certain drying method. Aerogel is very strong and durable, and has good compression resistance, torsion resistance and bending resistance. At the same time, aerogel is light in weight. In addition, its thermal conductivity and refractive index are also very low, and its insulation ability is good. By setting the tensile rod 7, the tensile performance of the inner core strip 1 is further improved, and the tensile performance of the entire cable is improved.

[0031] like Figure 2 As shown, in some embodiments, the outer surface of the tensile rod 7 is arrayed with a plurality of limit plates 8 along its length direction, and the plurality of limit plates 8 are embedded in the inner core strip 1. The limit plates 8 are provided to increase the connection strength between the tensile rod 7 and the inner core strip 1, thereby further improving the tensile performance of the inner core strip 1.

[0032] like Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, a plurality of ventilation grooves 9 are arranged in an array on the outer surface of the inner core strip 1, and the two end ports of the ventilation grooves 9 are respectively connected to the two end ports of the inner core strip 1. When the cable is running at high load, the core 3 will generate a large amount of heat. By providing the ventilation grooves 9 on the inner core strip 1, heat can be easily circulated and dissipated to avoid heat accumulation, which may cause the inner core strip 1 to melt, thereby ensuring the tensile strength of the inner core strip 1 and avoiding the increase in internal resistance of the core 3 due to the increase in temperature, which may have a certain impact on the normal use of the cable.

[0033] like Figure 3 and Figure 5 As shown, in some embodiments, a plurality of air grooves 9 are respectively opened on the inner walls of a plurality of spiral embedded grooves 2 and distributed along the spiral direction. The air grooves 9 are opened on the inner walls of the spiral embedded grooves 2, so that the heat generated by the wire core 3 can be dissipated more quickly through the air grooves 9, thereby improving practicality.

[0034] like Figure 3 and Figure 5 As shown, in some embodiments, the outer jacket layer 6 includes a low-smoke halogen-free polyolefin layer 601 arranged on the outer surface of the inner jacket layer 4. The polyolefin is composed of hydrocarbons, which decompose into carbon dioxide and water when burned, and do not produce obvious smoke and harmful gases. It has good flame retardant properties. The outer surface of the low-smoke halogen-free polyolefin layer 601 is provided with an alumina ceramic layer 602. Alumina ceramics have the advantages of high hardness and excellent wear resistance, which can protect the low-smoke halogen-free polyolefin layer 601 and ensure the overall flame retardancy of the cable.

[0035] like Figure 5As shown, in some embodiments, a steel bar 10 is spirally wound between the inner sleeve layer 4 and the low-smoke halogen-free polyolefin layer 601. Through the spirally arranged steel bar 10, when the cable is under pressure, the spirally wound structure of the steel bar 10 will generate circumferential tensile stress, thereby sharing the pressure at the pressure point, and cooperating with the support and protection of the inner core bar 1, thereby improving the overall compressive resistance of the cable.

[0036] like Figure 5 As shown, in some embodiments, the outer wall of the inner sleeve 4 and the inner wall of the low-smoke halogen-free polyolefin layer 601 both begin to have spiral slots 11, and the steel bar 10 is spirally inserted in the two spiral slots 11. Through the opened spiral slots 11, the steel bar 10 can not only serve as a compressive protective member, but also cooperate with the insertion of the two spiral slots 11 to improve the connection strength between the inner sleeve 4 and the low-smoke halogen-free polyolefin layer 601, thereby further improving the tensile performance 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 tensile low-smoke halogen-free cable, characterized in that: include: An inner core strip (1) has a plurality of spiral grooves (2) arranged in an array on its outer surface, and a wire core (3) is embedded in each of the plurality of spiral grooves (2); An inner sleeve layer (4) is sleeved on the outer surface of the inner core strip (1) and the plurality of wire cores (3), and a spiral groove is formed between two adjacent wire cores (3) and in the portion protruding outside the inner core strip (1). The inner wall array of the inner sleeve layer (4) is configured with a plurality of spiral clamping strips (5), and the plurality of spiral clamping strips (5) are respectively engaged with the plurality of spiral clamping grooves; The outer sleeve layer (6) is sleeved on the outer surface of the inner sleeve layer (4).

2. The tensile-resistant low-smoke halogen-free cable according to claim 1, characterized in that: A tension rod (7) is coaxially arranged inside the inner core strip (1).

3. The tensile-resistant low-smoke halogen-free cable according to claim 2, characterized in that: The outer surface of the tension rod (7) is provided with a plurality of limit plates (8) in an array along its length direction, and the plurality of limit plates (8) are all embedded in the inner core strip (1).

4. The tensile-resistant low-smoke halogen-free cable according to claim 1, characterized in that: The outer surface of the inner core strip (1) is provided with a plurality of air permeable grooves (9) in an array, and the two end ports of the air permeable grooves (9) are respectively connected to the two end ports of the inner core strip (1).

5. The tensile-resistant low-smoke halogen-free cable according to claim 4, characterized in that: The plurality of air permeable grooves (9) are respectively arranged on the inner walls of the plurality of spiral embedding grooves (2) and are distributed along the spiral direction thereof.

6. The tensile-resistant low-smoke halogen-free cable according to claim 1, characterized in that: The outer jacket layer (6) comprises a low-smoke halogen-free polyolefin layer (601) arranged on the outer surface of the inner jacket layer (4), and an alumina ceramic layer (602) is arranged on the outer surface of the low-smoke halogen-free polyolefin layer (601).

7. The tensile-resistant low-smoke halogen-free cable according to claim 6, characterized in that: A steel bar (10) is spirally wound between the inner sleeve layer (4) and the low-smoke halogen-free polyolefin layer (601).

8. The tensile-resistant low-smoke halogen-free cable according to claim 7, characterized in that: The outer wall of the inner sleeve layer (4) and the inner wall of the low-smoke halogen-free polyolefin layer (601) both begin to have spiral slots (11), and the steel bars (10) are spirally inserted in the two spiral slots (11).

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