CN207397743U - Environment-friendly type thermostable PVC cables - Google Patents

Abstract

A kind of environment-friendly type thermostable PVC cables of simple structure and low cost, armouring antiseptic property is good.Its insulating layer is the temperature-resistant insulation layer exempted from irradiation low-smoke low-halogen polyvinyl chloride by resistance to 125 DEG C and formed using the mode that extrudes, high-temperature resistant inner lining layer is additionally provided in all be enclosed with outside the conductor of temperature-resistant insulation layer, the high temperature resistant filled layer that clearance space therebetween is filled up using low-smoke non-halogen flame-retardant high temperature packing rope is additionally provided between temperature-resistant insulation layer and high-temperature resistant inner lining layer between adjacent temperature-resistant insulation layer.It uses the requirement that temperature resistant grade reaches 125 DEG C and exempts to irradiate insulating layer and outer jacket that low-smoke low-halogen polyvinyl chloride makes, so that the cable made has, temperature resistant grade is high, exempt from irradiation, flame retardant property is good, at low cost, while also has many advantages, such as that low-smoke low-halogen is environmentally protective.The cable production cost is low, production process is few, product quality is easy to control.

Description

Environmentally friendly high temperature resistant PVC cable

technical field

The utility model relates to a PVC cable, in particular to a PVC cable with low smoke, low halogen and high temperature resistance.

Background technique

With the continuous expansion of my country's electric power industry, data communication industry, urban rail transit industry, automobile industry, and shipbuilding industries, the demand for wires and cables is also growing rapidly, and the requirements for wires and cables are getting higher and higher.

Polyvinyl chloride (PVC) is often used as a material for wire and cable insulation and sheaths because of its superior mechanical properties, chemical corrosion resistance, non-flammability, good weather resistance, good electrical insulation performance, easy processing, and low cost. , which is the most widely used polymer material in the wire and cable industry. In the prior art, PVC cables have been widely used as the insulation and sheath of wires and cables. However, due to the structural shortcomings of PVC itself, the temperature resistance level of ordinary PVC is only 70°C or 90°C. , so that it can meet the requirements of a higher temperature resistance level, but correspondingly, its production process will become cumbersome, process quality control is difficult, and product quality cannot be guaranteed. In addition, the PVC material itself contains halogen, and a large amount of dense smoke and acid gas generated when the material is burned will cause poison and pollution to the human body and the environment.

In response to national energy conservation and environmental protection requirements, XLPE insulated cables are often used instead of PVC insulated cables in the current wire and cable industry. However, due to the high price of XLPE materials and the need to achieve a high temperature resistance level, the production process is more cumbersome. , the production cost is higher. In addition, the galvanized steel strip wrapped around the cable needs to be protected by a zinc layer protective steel strip under natural conditions. When the zinc layer is consumed, the steel strip will corrode.

Therefore, it is an urgent problem to be solved in the industry to develop an environment-friendly high-temperature-resistant PVC cable with low cost, good electrical insulation and anti-corrosion performance.

Utility model content

The technical problem to be solved by the utility model is to provide an environment-friendly high temperature resistant PVC cable with simple structure, low cost and good armored anticorrosion performance.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

The environment-friendly high-temperature-resistant PVC cable of the utility model includes at least two conductors and an insulating layer wrapped outside each conductor, and is characterized in that: the insulating layer is made of 125°C radiation-free low-smoke low-halogen polychloride The high temperature resistant insulating layer made of ethylene is extruded. In addition to all the conductors wrapped with the high temperature resistant insulating layer, there is also a high temperature resistant inner lining layer. Between adjacent high temperature resistant insulating layers and between the high temperature resistant insulating layer and the resistant There is also a high-temperature-resistant filling layer between the high-temperature lining layers, which uses low-smoke, halogen-free, flame-retardant high-temperature filling ropes to fill the interstitial space.

There are four conductors, the cross-section center of each conductor is the apex of a square, and the high temperature resistant insulating layers of two adjacent conductors are arranged tangentially.

In addition to the high-temperature-resistant inner lining, there is also a graphene anti-corrosion armor layer using graphene composite steel strips instead of galvanized steel strips or painted steel strips.

In addition to the graphene anti-corrosion armor layer, there is also a high-temperature-resistant outer sheath made of 125°C radiation-free low-smoke low-halogen polyvinyl chloride by extrusion.

The high-temperature-resistant inner lining layer is wrapped with low-smoke, halogen-free, flame-retardant tape, and the covering rate of the wrapping is not less than 20%.

The conductor is made of thin round copper wires twisted and compressed to form a round conductor or special-shaped conductor, or soft round copper wire or tinned soft round copper wire is twisted to form a soft conductor structure.

Compared with the prior art, the utility model adopts the insulation layer and the outer sheath made of radiation-free low-smoke low-halogen polyvinyl chloride, which requires a temperature resistance level of 125°C, so that the produced cable has a temperature resistance level. High, radiation-free, good flame retardant performance, low cost, and also has many advantages of low smoke, low halogen, green and environmental protection. The cable production cost of the utility model is low, the production process is few, and the product quality is easy to control.

Description of drawings

Fig. 1 is a schematic diagram of a section structure of a cable of the present invention.

Conductor 1, high temperature resistant insulation layer 2, high temperature resistant filling layer 3, high temperature resistant inner lining layer 4, graphene anti-corrosion armor layer 5, high temperature resistant outer sheath layer 6.

Detailed ways

As shown in Figure 1, the environment-friendly high-temperature-resistant PVC cable of the present invention consists of at least two conductors 1, a high-temperature-resistant insulating layer 2 wrapped outside each conductor 1, and a high-temperature-resistant inner lining 4 that wraps all conductors 1 therein. , the graphene anticorrosion armor layer 5 wrapped outside the high temperature resistant inner liner 4 and the high temperature resistant outer sheath 6 wrapped outside the graphene anticorrosion armor layer 5 and filled in the high temperature resistant insulating layer 2 and the high temperature resistant The high temperature resistant filling layer 3 between the lining layers 4 is formed.

1. Conductor 1

The conductor 1 of the present utility model is preferably four (can be set to many, as three, five or more), and each conductor 1 is formed circular conductor 1 or special-shaped conductor 1 by fine round copper wire stranded tight pressing, Alternatively, soft round copper wires or tinned soft round copper wires are twisted to form the soft conductor 1 structure. The conductor 1 structure can improve the flexibility and bendability of the entire cable.

2. High temperature resistant insulating layer 2

The insulation layer 2 is made of 125°C radiation-free low-smoke low-halogen polyvinyl chloride wrapped outside each conductor 1 by extrusion, and the four conductors 1 wrapped with the insulation layer 2 are tangent to each other in turn. form a square.

The use of 125°C radiation-free low-smoke low-halogen polyvinyl chloride does not require radiation cross-linking, which not only improves the high-temperature resistance of the cable, but also saves the equipment investment required for radiation cross-linking , At the same time, the material cost is also reduced.

The insulating layer 2 is formed by extruding to obtain a uniform thickness, round and smooth insulating layer 2, and at the same time, its elasticity and toughness can be improved, and the pollution to the environment and the harm to the human body can be reduced when the cable is burned.

3. High temperature resistant filling layer 3

The filling layer 3 is filled with low-smoke, halogen-free, flame-retardant and high-temperature-resistant filling ropes to fill the gap space between all conductors 1 containing high-temperature-resistant insulating layers 2, that is, between the high-temperature-resistant insulating layers 2 of two adjacent conductors 1 and The gap space formed between the high temperature resistant insulating layer 2 and the high temperature resistant inner lining layer 4 of each conductor 1 is filled with the high temperature resistant filling rope.

The filling layer 3 is arranged in such a way that the low-smoke, halogen-free, flame-retardant, high-temperature-resistant filling rope is filled between the high-temperature-resistant insulating layers of the cable along the longitudinal direction of the cable during cabling (that is, all the conductors 1 containing the high-temperature-resistant insulating layer 2 are gathered together). The amount of low-smoke, halogen-free, flame-retardant and high-temperature-resistant filling rope used in the gap between (center and around) is subject to filling the gap. This structure can not only further improve the high-temperature resistance of the cable, but also improve the cable's In addition, it can also reduce the pollution to the environment and the harm to the human body when the cable is burned.

4. High temperature resistant inner lining 4

The inner liner 4 is made of low-smoke, halogen-free, flame-retardant non-alkali glass fiber wrapping tape.

After the high-temperature-resistant filling layer 3 is completed, the high-temperature-resistant lining layer 4 is tightly wound outside the high-temperature-resistant filling layer 3 by wrapping, which may be one layer or multiple layers. When winding, the overlapping rate of the wrapping (that is, the overlapping rate between the front turn and the back turn) is not less than 20%.

The inner lining layer 4 can further improve the high temperature resistance of the cable and reduce the pollution to the environment and the damage to the human body when the cable is burned.

5. Graphene anti-corrosion armor layer 5

The armor layer 5 is made of a special steel strip made of graphene composite coating, and the wrapping rate is not less than 30%. It is used to replace the galvanized steel strip or painted steel strip in the prior art. The armor layer 5.

Graphene composite steel strip, because the graphene deposition layer has the advantages of good compactness, high strength and good chemical stability, can greatly improve its anti-corrosion performance, and effectively solve the problem of using steel strips as the armor layer 5 in the prior art that is easy to be damaged. corrosion problem.

6. High temperature resistant outer sheath 6

The outer sheath 6 is a sheath made of 125°C radiation-free low-smoke low-halogen polyvinyl chloride, and the sheath is formed outside the graphene anti-corrosion armor layer 5 by extrusion.

The sheath made of 125°C radiation-free low-smoke low-halogen polyvinyl chloride is easy to obtain a round and smooth cable, and at the same time, it can also protect the insulation performance of the cable and avoid mechanical damage. It has high temperature resistance, high flame retardancy, Features such as low smoke and low halogen.

The high-temperature-resistant insulating layer 2 and the high-temperature-resistant outer sheath 6 in the PVC cable of the present utility model are both made of 125°C-resistant low-smoke low-halogen polyvinyl chloride, which has the following characteristics:

1) It has good mechanical and electrical properties, its volume resistivity can reach 3.7×10 ¹² , and its dielectric strength can reach 22KV/mm.

2) Without irradiation, the requirement of long-term allowable working temperature of 125°C for cables can be met, and irradiation costs can be avoided, production costs can be reduced, and production procedures can be simplified.

3) Compared with thermosetting PVC materials, it has better flame retardancy, no dripping when burning, and has low-smoke and low-halogen performance. Its waste materials can be recycled and reused, which indirectly reduces production costs and realizes energy saving and environmental protection.

4) It is easy to process, has good thermal stability, and has a good wire extrusion speed. It can be produced with a traditional PVC wire extruder, and the surface of the extruded wire is smooth.

5) Compared with cross-linked polyethylene insulated cables, the material price is low, the production process is simple, and the production cost is low.

Claims (6)

1. a kind of environment-friendly type thermostable PVC cables including at least two conductors (1) and are wrapped in exhausted outside every conductor (1) Edge layer (2), it is characterised in that：The insulating layer (2) is to exempt from the polyvinyl chloride use of irradiation low-smoke low-halogen by resistance to 125 DEG C to extrude mode The temperature-resistant insulation layer (2) of composition is additionally provided with high-temperature resistant inner lining layer in all be enclosed with outside the conductor of temperature-resistant insulation layer (2) (4), it is additionally provided with and adopts between temperature-resistant insulation layer (2) and high-temperature resistant inner lining layer (4) between adjacent temperature-resistant insulation layer (2) The high temperature resistant filled layer (3) of clearance space therebetween is filled up with low-smoke non-halogen flame-retardant high temperature packing rope.

2. environment-friendly type thermostable PVC cables according to claim 1, it is characterised in that：The conductor (1) is four, respectively The section center of conductor (1) is respectively a square vertex, and the temperature-resistant insulation layer (2) of adjacent two conductors (1) is tangent It sets.

3. environment-friendly type thermostable PVC cables according to claim 2, it is characterised in that：In the high-temperature resistant inner lining layer (4) outside, it is additionally provided with the graphene anti-corrosion armor (5) that galvanized steel strip or painted steel band are substituted using graphene composite steel band.

4. environment-friendly type thermostable PVC cables according to claim 3, it is characterised in that：In the graphene anti-corrosion armouring Outside layer (5), the high temperature resistant outer jacket exempted from irradiation low-smoke low-halogen polyvinyl chloride by resistance to 125 DEG C and formed using the mode that extrudes is additionally provided with (6)。

5. environment-friendly type thermostable PVC cables according to claim 1, it is characterised in that：The high-temperature resistant inner lining layer (4) by Low-smoke non-halogen flame-retardant band is wrapped to be formed, and wrapped cap rate is not less than 20%.

6. environment-friendly type thermostable PVC cables according to claim 1, it is characterised in that：The conductor (1) is by thin round copper wire It is twisted to press composition round conductor or profile conductor or be twisted by soft round copper wire or tin plating soft round copper wire and formed flexible conductor knot Structure.