A power cable for large mechanical engines

Abstract

The present invention discloses a power cable for a large-scale mechanical engine, wherein a plurality of wire cores 2 are evenly distributed on the outside of a wire core 1, and a plurality of wire cores 3 are respectively arranged between two adjacent wire cores 2 to form a cable core, and a thermoplastic elastomer anti-seismic layer, a flame-retardant tensile layer, a multi-layer galvanized steel belt armor layer, and a nickel-plated copper corrugated tube longitudinal outer sheath are sequentially coated on the outside of the cable core. The present invention designs a plurality of hollow rubber tubes in the middle part of the cable, and the heat generated inside the cable can be dissipated from the hollow rubber tubes, ensuring the stability of long-term operation. The hollow rubber tubes can also increase the strength of the cable, and adopt an anti-seismic layer design to ensure stable and reliable operation in a continuously vibrating working environment. The cable as a whole is not easy to deform, and at the same time has excellent shielding performance, anti-extrusion performance, and fireproof performance.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a power cable for a large mechanical engine. Background Art

[0002] With the rapid advancement of automation and high technology, the number of various instruments installed on the engines of many large machinery on the market has increased, which has led to a relatively increased number of cables. However, the engine will produce frequent vibrations during operation, which often cause the cables to be easily deformed and damaged. In severe cases, it will cause abnormal operation of instruments, thereby affecting the normal use of the equipment and reducing work efficiency. In addition, after long-term use, the heat inside the cable cannot be dissipated, affecting the working stability of the cable. Summary of the invention

[0003] The purpose of the present invention is to remedy the defects of the prior art and provide a power cable for a large mechanical engine.

[0004] The present invention is achieved through the following technical solutions:

[0005] A power cable for a large mechanical engine, comprising a wire core 1, a wire core 2 and a wire core 3, wherein the wire core 1 comprises a plurality of hollow rubber tubes and a plurality of conductors 1, and a low-smoke halogen-free polyolefin insulation layer is coated on the outside of the conductors 1, one of the hollow rubber tubes is placed at a central position, and the remaining hollow rubber tubes are arranged at intervals with the plurality of conductors 1 on the outside of the central hollow rubber tube and coated with an aluminum-plastic composite film shielding layer on the outside, the wire core 2 comprises a conductor 2 and a high elastic modulus ethylene-propylene rubber sequentially coated on the outside of the conductor 2 The cable core comprises a rubber insulation layer and a silver-plated alloy wire braided shielding layer as the base material, the wire core three comprises a conductor three, a cross-linked ethylene tetrafluoroethylene copolymer insulation layer is coated on the outside of the conductor three, the conductor three is twisted with a carbon fiber bundle and then coated with a copper-plastic composite tape wrapping layer, a plurality of wire cores two are evenly distributed on the outside of the wire core one, and a plurality of wire cores three are respectively arranged between two adjacent wire cores two to form a cable core, and a thermoplastic elastomer anti-seismic layer, a flame retardant and tensile layer, a multi-layer galvanized steel belt armor layer and a nickel-plated copper corrugated tube longitudinal outer sheath are sequentially coated on the outside of the cable core.

[0006] The inside of the wire core 1, the inside of the wire core 2, the inside of the wire core 3, the gaps between the wire core 1 and the wire core 2, and the gaps between the wire core 2 and the wire core 3 are all filled with glass fiber filling layers.

[0007] The flame retardant tensile layer is composed of a plurality of flame retardant tensile strips arranged in parallel on the outside of the thermoplastic elastomer anti-seismic layer. The flame retardant tensile strips include a central flame retardant strip, and a plurality of outer filling ropes are twisted outside the central flame retardant strip.

[0008] The advantages of the present invention are as follows: a plurality of hollow rubber tubes are designed in the middle part of the cable, and the heat generated inside the cable can be dissipated from the hollow rubber tubes, thereby ensuring the stability of long-term operation. The hollow rubber tubes can also increase the strength of the cable, and adopt a shock-resistant layer design to ensure stable and reliable operation in a continuously vibrating working environment. The cable as a whole is not easy to deform, and at the same time has excellent shielding performance, anti-extrusion performance and fireproof performance; the flame-retardant strip can also play a flame-retardant role when the cable is burned, and the flame-retardant effect is good. The setting of the external filling rope helps to increase the tensile strength of the cable, so that the cable is suitable for occasions where it is frequently dragged and moved, and is not easy to deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the present invention.

[0010] Figure 2 Schematic diagram of the flame retardant tensile strip structure. DETAILED DESCRIPTION

[0011] like Figure 1 As shown, a power cable for a large mechanical engine includes a wire core 1, a wire core 2 and a wire core 3, wherein the wire core 1 includes a plurality of hollow rubber tubes 1 and a plurality of conductors 2, and a low-smoke halogen-free polyolefin insulation layer 3 is coated on the outside of the conductor 2, one of the hollow rubber tubes 1 is placed at the center, and the remaining hollow rubber tubes are arranged at intervals with the plurality of conductors 2 on the outside of the central hollow rubber tube 1 and coated with an aluminum-plastic composite film shielding layer 4 on the outside, and the wire core 2 includes a conductor 2 5 and a high elastic modulus ethylene-propylene rubber base material sequentially coated on the outside of the conductor 2 5 The rubber insulation layer 6 and the silver-plated alloy wire braided shielding layer 7, the wire core three includes a conductor three 8, the outer side of the conductor three 8 is coated with a cross-linked ethylene tetrafluoroethylene copolymer insulation layer 9, the conductor three 8 is twisted with a carbon fiber tow 10 and then coated with a copper-plastic composite tape winding layer 11, a plurality of wire cores two are evenly distributed on the outer side of the wire core one, and a plurality of wire cores three are respectively arranged between two adjacent wire cores two to form a cable core, and the outer side of the cable core is sequentially coated with a thermoplastic elastomer anti-seismic layer 12, a flame retardant and tensile layer 13, a multi-layer galvanized steel belt armor layer 14 and a nickel-plated copper corrugated tube longitudinal outer sheath 15.

[0012] The inside of the wire core 1, the inside of the wire core 2, the inside of the wire core 3, the gaps between the wire core 1 and the wire core 2, and the gaps between the wire core 2 and the wire core 3 are all filled with glass fiber filling layers.

[0013] like Figure 2 As shown, the flame retardant tensile layer 13 is composed of a plurality of flame retardant tensile strips arranged in parallel on the outside of the thermoplastic elastomer anti-seismic layer 12, and the flame retardant tensile strips include a central flame retardant strip 16, and a plurality of outer filling ropes 17 are twisted on the outside of the central flame retardant strip.

[0014] The low-smoke halogen-free polyolefin insulation layer 3, the rubber insulation layer 6 with high elastic modulus EPDM as the base material, and the cross-linked ethylene tetrafluoroethylene copolymer insulation layer 9 are respectively 0.2 times or more and 0.3 times or less of the outer diameter of the conductor 1 2, the conductor 2 5, and the conductor 3 8. When the thickness of the insulation layer is less than 0.2 times the outer diameter of the conductor, the thickness of the insulation layer is too thin, and the strength is weakened when the cable is bent, and there is a risk of the insulation layer breaking. By setting the thickness of the insulation layer to be more than 0.2 times the outer diameter of the conductor, sufficient strength can be ensured. On the other hand, when the thickness of the insulation layer exceeds 0.3 times the outer diameter of the conductor, the insulation layer becomes hard and the flexibility becomes poor due to the excessive thickness of the insulation layer, and there is a risk of the insulation layer breaking when the cable is bent. By making the thickness of the insulation layer less than 0.3 times the outer diameter of the conductor, its flexibility can be ensured.

Claims

1. A power cable for a large mechanical engine, characterized in that: The invention comprises a wire core 1, a wire core 2 and a wire core 3, wherein the wire core 1 comprises a plurality of hollow rubber tubes and a plurality of conductors 1, and a low-smoke halogen-free polyolefin insulation layer is coated on the outside of the conductors 1, one of the hollow rubber tubes is placed at a central position, and the remaining hollow rubber tubes are arranged at intervals with the plurality of conductors 1 on the outside of the central hollow rubber tube and coated with an aluminum-plastic composite film shielding layer on the outside, and the wire core 2 comprises a conductor 2 and a rubber insulation layer with a high elastic modulus ethylene-propylene rubber as a base material sequentially coated on the outside of the conductor 2 layer and a silver-plated alloy wire braided shielding layer, the wire core three includes a conductor three, a cross-linked ethylene tetrafluoroethylene copolymer insulation layer is coated on the outside of the conductor three, the conductor three is twisted with a carbon fiber tow and then coated with a copper-plastic composite tape wrapping layer, a plurality of wire cores two are evenly distributed on the outside of the wire core one, and a plurality of wire cores three are respectively arranged between two adjacent wire cores two to form a cable core, and a thermoplastic elastomer anti-seismic layer, a flame-retardant and tensile layer, a multi-layer galvanized steel belt armor layer and a nickel-plated copper corrugated tube longitudinal outer sheath are sequentially coated on the outside of the cable core; The inside of the wire core 1, the inside of the wire core 2, the inside of the wire core 3, the gaps between the wire core 1 and the wire core 2, and the gaps between the wire core 2 and the wire core 3 are all filled with a glass fiber filling layer; The flame retardant tensile layer is composed of a plurality of flame retardant tensile strips arranged in parallel on the outside of the thermoplastic elastomer anti-seismic layer. The flame retardant tensile strips include a central flame retardant strip, and a plurality of outer filling ropes are twisted on the outside of the central flame retardant strip.

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