CN211907078U

CN211907078U - Medium-voltage fire-resistant cable for ships

Info

Publication number: CN211907078U
Application number: CN202020793585.8U
Authority: CN
Inventors: 刘焱鑫; 隋明辉; 刘彤彤
Original assignee: Changzhou Marine Cable Co ltd; Jiangsu Zhongli Group Co Ltd
Current assignee: Changzhou Marine Cable Co ltd; Jiangsu Zhongli Group Co Ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2020-11-10
Anticipated expiration: 2030-05-13

Abstract

The utility model discloses a naval vessel is with middling pressure fire resisting cable, its main points are: including principal line core, filling layer, inner liner, armor and oversheath. The main line core has 3, and 3 main line cores have the same structure. The liner layer includes a first liner layer, a second liner layer, and a third liner layer. 3 1 dextrad transposition stranding of main core, adopt fire-retardant inorganic fiber material to fill behind the stranding and form the filling layer, then form first inner liner around package inorganic fiber band. The second lining layer adopts an elastomer and is transformed into a solidified ceramic silicon rubber material when meeting fire to be extruded outside the first lining layer. The third lining layer adopts the EVA material crowded package outside the second lining layer. The armor layer is formed by weaving tinned copper wires outside the lining layer. The outer sheath is extruded outside the shielding layer by low-smoke halogen-free polyolefin material.

Description

Medium-voltage fire-resistant cable for ships

Technical Field

The utility model relates to a power cable technical field specifically is a naval vessel is with middling pressure fire resisting cable.

Background

With the continuous development of cables for ships, the power of propulsion equipment is continuously increased, the traditional low-voltage and high-current cables cannot meet the requirements of the current ship development in terms of space and weight, and a medium-voltage cable with 6/10kV voltage level is used in a 6.6kV system used in the current ship system, so that the overall volume and weight of the cable are reduced. The safety requirement of the medium-voltage cable for the ships is far higher than that of the low-voltage cable, particularly, when an accident occurs, whether continuous power supply can be kept is important, the medium-voltage cable is different from the low-voltage cable which is protected by a mica tape, all materials of the cable are burnt completely by a fire disaster under the working state of the cable, only a conductor and a mica layer wound on the surface of the conductor are left for electrical isolation, the mica layer cannot be wound on the surface of the conductor by the medium-voltage fire-resistant cable for the ships, on one hand, because the conductor needs to be extruded with a semi-conductive shielding layer, the electrical aging reliability of the local discharge performance of the cable is ensured, the surface of the conductor is uneven after the mica tape is wound, the local discharge capacity of the cable is increased, on the other hand, after the fire occurs, because the medium-voltage cable for the ships has high voltage level, the cable after the fire only depends on the mica, causing equipment loss and personal injury.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure, better middling pressure fire resisting cable for naval vessel of refractiveness.

Realize the utility model discloses the basic technical scheme of purpose is: a ship is with middling pressure fire resisting cable, its structural feature is: including principal line core, filling layer, inner liner, armor and oversheath. The main line core has 3, and 3 main line cores have the same structure. The liner layer includes a first liner layer, a second liner layer, and a third liner layer. 3 1 dextrad transposition stranding of main core, adopt fire-retardant inorganic fiber material to fill behind the stranding and form the filling layer, then form first inner liner around package inorganic fiber band. The second lining layer adopts an elastomer and is transformed into a solidified ceramic silicon rubber material when meeting fire to be extruded outside the first lining layer. The third lining layer adopts the EVA material crowded package outside the second lining layer. The armor layer is formed by weaving tinned copper wires outside the lining layer. The outer sheath is extruded outside the shielding layer by low-smoke halogen-free polyolefin material.

The technical scheme based on the basic technical scheme is as follows: the main wire core is provided with a conductor, a conductor shielding layer, an insulating shielding layer and a shielding layer from inside to outside in turn along the radial direction of the main wire core. The conductor is formed by stranding and pressing a plurality of copper wires or metal-plated copper wires with the same monofilament diameter. The conductor shielding layer is extruded outside the conductor by the semi-conductive shielding material. The insulating layer is extruded outside the conductor shielding layer by ethylene propylene rubber material. The insulation shielding layer is extruded outside the insulation layer by a semi-conductive insulation shielding material. The conductor shielding layer, the insulating layer and the insulating shielding layer are coated outside the conductor in a three-layer co-extrusion mode. The shielding layer is wrapped outside the insulating shielding layer in a single-layer overlapping mode through a bare copper strip, and the thickness of the bare copper strip is 0.12 mm-0.14 mm.

The utility model discloses following beneficial effect has: (1) the utility model discloses a naval vessel is with middling pressure fire resisting cable simple structure, and fire resistance is better. The conductor of the main wire core adopts a tinned copper wire stranded structure, the conductor shielding layer, the insulating layer and the insulating shielding layer adopt a three-layer co-extrusion structure, and the shielding layer is wrapped by a copper strip. 3 main wire cores are stranded into a cable and then filled with inorganic fiber materials to form a filling layer. The inner liner layer adopts a three-layer composite structure and has good fire resistance, the first inner liner layer is wrapped by inorganic fiber wrapping tapes, under the condition of high-temperature flame, the flame-retardant inorganic fiber filling layer and the inorganic fiber wrapping tapes of the first inner liner layer are decomposed into metal oxides and precipitate crystal water, the metal oxides are decomposed to form a net structure, the net structure has a certain adsorption effect on smoke, the precipitated crystal water has an obvious sedimentation effect on smoke particles and also has a good heat absorption effect, the second layer adopts an elastic body and is converted into a solidified ceramic silicon rubber material when encountering fire or high temperature, the tubular shell fire-resistant structure is rapidly converted when encountering fire or high temperature, the tubular shell fire-resistant structure can still be maintained for a certain time in a fire fighting environment and can effectively prevent the flame or high temperature from damaging the insulation of the inner layer, and the third layer adopts high-performance magnesium hydroxide aluminum hydroxide halogen-free flame-retardant EVA which takes Al (OH)3 and Mg (OH)2 as main bodies, the crystal water molecules generated by the material at high temperature or after combustion cool the adjacent layer, fully ensure that the temperature of the inner layer is properly reduced, and simultaneously ensure that the cable has the characteristics of high flame retardance and high current carrying. The armor adopts the tinned copper wire to weave the structure, plays mechanical protection such as whole tensile, and the oversheath adopts low smoke and zero halogen polyolefin material to crowd the package, possesses marine environment resistant characteristic, is favorable to extension cable life.

Drawings

Fig. 1 is the structure schematic diagram of the medium voltage fire-resistant cable for ships and warships of the present invention.

The reference numbers in the drawings are:

a main wire core 1, a conductor 1-1, a conductor shielding layer 1-2, an insulating layer 1-3, an insulating shielding layer 1-4, a shielding layer 1-5,

the filling layer (2) is filled with a filler,

an inner liner layer 3, a first inner liner layer 3-1, a second inner liner layer 3-2, a third inner liner layer 3-3,

the outer layer (4) of the armor layer,

an outer sheath 5.

Detailed Description

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

(example 1)

See fig. 1, the utility model discloses a naval vessel is with middling pressure fire resisting cable includes principal line core 1, filling layer 2, inner liner 3, armor 4 and oversheath 5.

Referring to fig. 1, the main wire core 1 has 3 main wire cores 1, and the 3 main wire cores 1 have the same structure. The 3 main wire cores 1 are respectively provided with a conductor 1-1, a conductor shielding layer 1-2, an insulating layer 1-3, an insulating shielding layer 1-4 and a shielding layer 1-5 from inside to outside in turn along the respective radial direction.

Referring to fig. 1, the conductor 1-1 is formed by stranding and compressing a plurality of copper wires or plated copper wires with the same monofilament diameter and nominal section of 10 to 400 square millimeters, and the embodiment is formed by stranding and compressing 925 monofilament tinned copper wires with nominal diameter of 0.490 millimeters.

Referring to fig. 1, conductor shield layers 1-2 are made of a semiconductive shield material. The conductor shielding layer 1-2 is extruded outside the conductor 1-1. The thickness of the conductor shielding layer 1-2 is 0.3 mm to 0.8 mm, and the thickness is 0.8 mm in the embodiment, so that the tensile strength of the conductor shielding layer 1-2 is not less than 12MPa, the elongation at break is not less than 150%, and the volume resistivity at 20 ℃ is not less than 100 ohm cm.

Referring to fig. 1, the insulating layers 1 to 3 are made of ethylene propylene rubber material, and the withstand voltage grade of the ethylene propylene rubber material of the embodiment is 10 kV. The insulating layer 1-3 is extruded outside the conductor shielding layer 1-2. The tensile strength of the insulating layers 1-3 is not less than 8MPa, the elongation at break is not less than 250%, and the insulating layers are aged in an air oven (the temperature is 135 +/-3 ℃ and the time is 168 hours), the tensile strength is not less than +/-30% of the original tensile strength, and the elongation at break is not less than +/-30% of the original elongation at break.

Referring to fig. 1, dielectric shield layers 1-4 are made of a semiconducting dielectric shield material. The insulation shielding layer 14 is extruded outside the insulation layer 13. The thickness of the insulation shielding layers 1 to 4 is 0.53 mm to 0.8 mm, the thickness is 0.8 mm in the embodiment, the tensile strength of the insulation shielding layers 1 to 4 is not less than 12MPa, the elongation at break is not less than 150%, and the volume resistivity at 20 ℃ is not less than 100 ohm cm.

Referring to fig. 1, a conductor shielding layer 1-2, an insulating layer 1-3 and an insulating shielding layer 1-4 are coated outside the conductor 1-1 by three-layer co-extrusion.

Referring to fig. 1, the shielding layers 1-5 are wrapped outside the insulating shielding layers 1-4 by single-layer overlapping of bare copper strips, the thickness of the bare copper strips is 0.12mm to 0.14mm, in this embodiment, 0.12mm, the covering rate is 20% to 30%, and in this embodiment, 25%.

The innerliner layer 3 includes a first innerliner layer 3-1, a second innerliner layer 3-2, and a third innerliner layer 3-3.

According to the scheme, 3 main wire cores 1 are twisted into a cable in the right direction, a filling layer 2 is formed by filling flame-retardant inorganic fiber materials after the cable is formed, then an inorganic fiber wrapping tape is wrapped to form a first lining layer 3-1, and the wrapping cover lapping rate is 40% -50%. The second lining layer 3-2 is made of elastomer and is transformed into a curing ceramic silicon rubber material when meeting fire, and the curing ceramic silicon rubber material is extruded outside the first lining layer 3-1. The third lining layer 3-3 is extruded outside the second lining layer 3-2 by using EVA material, and in this embodiment, high-performance magnesium hydroxide aluminum hydroxide halogen-free flame retardant EVA with al (oh)3 and mg (oh)2 as main bodies is used.

The armor layer 4 is formed by weaving tinned copper wires outside the lining layer 3, and the weaving coverage rate is 88-90%, and 88% in the embodiment.

Referring to fig. 1, the outer sheath 5 is made of low smoke halogen-free polyolefin material and is extruded outside the shielding layer 4.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a naval vessel is with middling pressure fire resisting cable which characterized in that: the cable comprises a main cable core, a filling layer, an inner lining layer, an armor layer and an outer sheath; the number of the main wire cores is 3, and the 3 main wire cores have the same structure; the lining layer comprises a first lining layer, a second lining layer and a third lining layer; 3 main wire cores are twisted into a cable in the right direction, a filling layer is formed by filling flame-retardant inorganic fiber materials after the cable is formed, and then an inorganic fiber wrapping tape is wrapped to form a first lining layer; the second lining layer adopts an elastomer and is transformed into a solidified ceramic silicon rubber material when meeting fire to be extruded outside the first lining layer; the third lining layer is extruded outside the second lining layer by adopting an EVA material; the armor layer is formed by weaving tinned copper wires outside the lining layer; the outer sheath is extruded outside the shielding layer by low-smoke halogen-free polyolefin material.

2. The medium voltage fire resistant cable for ships according to claim 1, characterized in that: the main wire core is sequentially provided with a conductor, a conductor shielding layer, an insulating shielding layer and a shielding layer from inside to outside along the radial direction of the main wire core; the conductor is formed by stranding and pressing a plurality of copper wires with the same monofilament diameter or plated copper wires; the conductor shielding layer is extruded outside the conductor by a semi-conductive shielding material; the insulating layer is extruded outside the conductor shielding layer by an ethylene propylene rubber material; the insulation shielding layer is extruded outside the insulation layer by a semi-conductive insulation shielding material; the conductor shielding layer, the insulating layer and the insulating shielding layer are coated outside the conductor by adopting three-layer co-extrusion; the shielding layer is wrapped outside the insulating shielding layer in a single-layer overlapping mode through a bare copper strip, and the thickness of the bare copper strip is 0.12 mm-0.14 mm.