CN214336416U

CN214336416U - Multi-core fire-resistant control cable for motor train unit

Info

Publication number: CN214336416U
Application number: CN202120312151.6U
Authority: CN
Inventors: 董俊; 袁杰; 王永财; 朱瑜; 王力
Original assignee: Jiangsu Shangshang Cable Group Co Ltd
Current assignee: Jiangsu Shangshang Cable Group Co Ltd
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-10-01
Anticipated expiration: 2031-02-04

Abstract

A fire-resistant control cable of multicore for EMUs, its structure is: a cable core is formed by twisting a plurality of insulated wire cores, and an isolation layer is formed by wrapping a layer of isolation belt outside the cable core; a braided shielding layer formed by a tinned copper wire is braided outside the isolation layer; an outer sheath formed by low-smoke halogen-free flame-retardant sheath materials is extruded outside the braided shielding layer; the structure of the insulated wire core is as follows: the conductor is formed by twisting tinned copper wires, a wrapping layer formed by wrapping mica tapes is wrapped outside the conductor, an insulating layer formed by low-smoke halogen-free flame-retardant insulating materials is extruded outside the wrapping layer, and in the conductor, the material of the conductor is a 5 th tinned copper conductor specified in GB/T3956; the mica tape of the wrapping layer is a cloth cover coating mica tape; the isolation belt is a polyester belt; the braided shielding layer is made of tinned copper wires. The cable has better technical performance, and is particularly suitable for multi-core fire-resistant cables for motor train units.

Description

Multi-core fire-resistant control cable for motor train unit

Technical Field

The technical scheme relates to the technical field of cables, in particular to a multi-core fire-resistant cable for a motor train unit.

Background

At present, the locomotive cable operation environment is special, the requirements of various used equipment and the like are high, for example, the locomotive cable used in a motor car has the advantage that the cable has high electrical performance to ensure that the requirement of normal operation can be met. In addition, in case of fire, the cable must have extremely strong fire resistance in order to protect the safety of passengers on the vehicle, and the fire cannot be further expanded due to the combustion of the cable and the water spray impact during fire extinguishing, thereby endangering the health of people. The cable also has a corresponding requirement for this problem, i.e. the cable must meet the test of fire resistance + impact.

In addition, temperature is an important factor affecting cable performance in the locomotive operating environment. Due to the regional differences in locomotive operation, the ambient temperature is different, which requires higher temperature adaptability of the cable.

Disclosure of Invention

In order to solve the problems in the prior art, the technical scheme provides a multi-core fire-resistant control cable for a motor train unit, which has the following structure:

a cable core is formed by twisting a plurality of insulated wire cores, and an isolation layer 4 formed by an isolation belt is wrapped outside the cable core; a braided shielding layer 5 consisting of a layer of tinned copper wire is braided outside the isolation layer; an outer sheath 6 formed by low-smoke halogen-free flame-retardant sheath materials is extruded on the outer layer of the braided shielding layer;

the structure of the insulated wire core is as follows: the conductor 1 is formed by twisting tinned copper wires; a lapping layer 2 formed by lapping mica tapes is wrapped outside the conductor; an insulating layer 3 made of low-smoke halogen-free flame-retardant insulating material is extruded outside the wrapping layer,

in the conductor 1, the material of the conductor is 5 th type tin-plated copper conductor (for locomotive cables) specified in GB/T3956; the conductor is formed by twisting tinned copper wires, and the pitch-diameter ratio of the tinned copper wires is 20-25 times (specifically 23 times). The wire diameter range of the tinned copper wire is 0.238 mm-0.243 mm (specifically 0.243mm can be selected), the conductor of the structure is a stranded conductor, the requirement on the outer diameter of the cable is met, the requirement on the softness of the cable is met, and the requirement on the outer diameter and the bending radius of the cable in detection indexes is specifically referred.

The mica tape of the wrapping layer is a cloth cover coating mica tape, the nominal thickness of the mica tape is 0.15-0.18 mm (0.165 mm can be selected specifically), and the overlapping rate is not less than 28 (30% can be selected specifically). The mica tape of the cloth cover coating has an effect of improving the fire resistance of the cable, and meanwhile, the specific thickness and the overlapping rate ensure that the cable has good fire resistance and can ensure the flexibility of the cable, and particularly refer to the bending radius and the fire resistance in the detection indexes.

The nominal thickness of the insulating layer is 0.3-0.6 mm (specifically 0.40mm can be selected), the average thickness is not less than the nominal thickness, and the thickness of the thinnest part is not less than 0.40mm multiplied by 90% -0.1 mm. The insulating material can be selected from FEW935, FJC876, and the low-smoke halogen-free flame-retardant insulating material with the thickness ensures the good electrical property of the cable, can ensure the flexibility of the cable, and has positive influence on the properties of the cable, such as insulation resistance, direct current stability, oil resistance, acid and alkali resistance, and the like.

The isolation belt is made of a polyester belt with the nominal thickness of 0.02-0.05 mm (specifically 0.024 mm); the cover width of the polyester tape is not less than 5mm (5.5 mm can be selected specifically). The polyester tape ensures the stability of the insulated wire cores during cabling, and the specific thickness and the overlapping width make the dielectric property of the cable stronger.

The material of weaving layer is the tinned copper wire, weaves the angle: 15-35 degrees (specifically 25 degrees can be selected); unidirectional coverage rate: 0.5528-0.90 (0.70 can be selected specifically); the diameter of each single wire of the tinned copper wire is 0.1-0.3 mm (specifically 0.12 mm). The selection of the wire diameter, the weaving angle and the weaving density effectively improves the shielding function of the cable and can effectively ensure the bending performance of the cable.

The nominal thickness of the outer sheath is 0.6-0.8 mm (specifically 0.7mm can be selected), the average thickness is not less than the nominal thickness, and the thickness of the thinnest part is not less than 0.7mm multiplied by 85% -0.1 mm. The sheathing material is usually FHW935H, FJC876-1, etc. The low-smoke halogen-free flame-retardant sheath material with the thickness ensures good flexibility, oil resistance, aging resistance and flame retardance of the cable.

The outer sheath is made of extruded low-smoke halogen-free flame-retardant sheath materials, and has good low-temperature resistance, fuel oil and mineral oil resistance and high flame-retardant property. The insulating layer is a low-smoke halogen-free flame-retardant insulating material, has good electrical performance, and has low temperature resistance and flame retardance. The cable is particularly suitable for cables with fire-resistant requirements for motor train units.

The cable is additionally provided with the isolation layer besides considering the mechanical property and the electrical property, the isolation layer adopts the polyester tape, the insulation wire core is protected, the insulation wire core is prevented from being damaged by stress action, the dielectric strength between the wire core and the shield is successfully enhanced, and the wire core and the braided shield are prevented from being punctured, so that the cable is prevented from being out of work or even generating fire. This cable has ensured the bending property and the compliance requirement of cable together around covering and insulating layer, isolation layer, sheath to adapt to various locomotive and lay the condition.

Drawings

Fig. 1 is a schematic radial cross-sectional view of a cable of this example.

In the figure: conductor 1, around covering 2, insulating layer 3, isolation layer 4, braided shield 5, oversheath 6.

Detailed Description

The technical scheme is further explained by combining the drawings and the detailed implementation mode as follows:

referring to fig. 1, a multi-core fire-resistant control cable for a motor train unit has a structure that: a cable core is formed by twisting a plurality of (2 in this example) insulated wire cores, and an isolation layer 4 formed by an isolation belt is wrapped outside the cable core; a braided shielding layer 5 consisting of a layer of tinned copper wire is braided outside the isolation layer; an outer sheath 6 formed by low-smoke halogen-free flame-retardant sheath materials is extruded on the outer layer of the braided shielding layer;

the structure of the insulated wire core is as follows: the conductor 1 is formed by twisting tinned copper wires; a lapping layer 2 formed by lapping mica tapes is wrapped outside the conductor; and an insulating layer 3 made of low-smoke halogen-free flame-retardant insulating material is extruded outside the wrapping layer.

In the conductor 1, the material of the conductor is a 5 th tin-plated copper conductor specified in GB/T3956; the conductor is formed by twisting tinned copper wires, and the pitch diameter ratio of the tinned copper wires is 20-25 times (23 times in the embodiment). The diameter of the tinned copper wire is in the range of 0.238mm to 0.243mm (0.243 mm in this example).

The mica tape of the wrapping layer is a cloth cover coating mica tape, the nominal thickness of the mica tape is 0.15-0.18 mm (0.165 mm in the embodiment), and the overlapping rate is not less than 28 (30% in the embodiment).

The nominal thickness of the insulating layer is 0.3-0.6 mm (0.40 mm in the example), the average thickness is not less than the nominal thickness, and the thickness of the thinnest part is not less than 0.40mm multiplied by 90% -0.1 mm.

The isolation belt is made of polyester belt with nominal thickness of 0.02-0.05 mm (0.024 mm in the example); the width of the cover of the polyester tape is not less than 5mm (5.5 mm in this example).

The material of weaving layer is the tinned copper wire, weaves the angle: 15-35 ° (25 ° in this example); unidirectional coverage rate: 0.5528 to 0.90 (0.70 in this example); the diameter of each single wire of the tinned copper wire is 0.1-0.3 mm (0.12 mm in the example).

The nominal thickness of the outer sheath is 0.6-0.8 mm (0.7 mm in the example), the average thickness is not less than the nominal thickness, and the thickness of the thinnest part is not less than 0.7mm multiplied by 85% -0.1 mm.

The outer sheath is made of low-smoke halogen-free flame-retardant sheath material with good mineral oil and fuel oil resistance and high flame-retardant property.

The main function/performance detection indexes of the cable are as follows:

1. the maximum long-term allowable operating temperature of the cable conductor is 90 ℃.

2. When the cable is laid, the environmental temperature is not lower than-15 ℃; when the cable is used, the ambient temperature is not lower than-40 ℃.

3. The maximum temperature of the cable at short circuit (maximum duration not exceeding 5s) is 200 ℃.

4. The allowable bend radius of the cable is 6D (D is the cable diameter).

5. The fire resistance of the cable can meet the requirements of a severe fire resistance test: a flame temperature of 830 ℃ to 870 ℃, an alternating current of 1kV voltage class, and a 90min fire and impact resistance test (impact interval of 5 min).

6. The insulation and the sheath of the cable completely meet the requirements of fuel oil resistance (70 ℃, 7d) and mineral oil resistance (100 ℃, 3d), and can be used in severe environment.

7. The insulation and the sheath of the cable completely meet the aging test, the insulation (135 ℃, 7d) and the sheath (120 ℃, 10d) have large allowance and long service life.

8. The finished product of the cable has excellent flame retardant property, large bundling allowance and light transmittance not less than 70%.

The external environment temperature of the cable can reach minus 40 ℃ to plus 40 ℃, and the long-term allowable working temperature of the cable is 90 ℃, which is enough to meet the conditions required by the operation of a locomotive.

Claims

1. A fire-resistant control cable of multicore for EMUs, its structure is: a cable core is formed by twisting a plurality of insulated wire cores, and an isolation layer (4) is formed by wrapping a layer of isolation belt outside the cable core; a braided shielding layer (5) formed by a tinned copper wire is braided outside the isolation layer; an outer sheath (6) formed by low-smoke halogen-free flame-retardant sheath materials is extruded outside the braided shielding layer;

the structure of the insulated wire core is as follows: a conductor (1) formed by twisting tinned copper wires, a wrapping layer (2) formed by wrapping mica tapes outside the conductor, an insulating layer (3) formed by extruding low-smoke halogen-free flame-retardant insulating materials outside the wrapping layer,

in the conductor (1), the material of the conductor is a 5 th tin-plated copper conductor specified in GB/T3956; the conductor is formed by twisting tinned copper wires, and the pitch-diameter ratio of the tinned copper wires is 20-25 times; the wire diameter of the tinned copper wire is required to be 0.238-0.243 mm;

the mica tape of the wrapping layer is a cloth cover coating mica tape, the nominal thickness of the mica tape is 0.15-0.18 mm, and the overlapping rate is not less than 28%;

the isolation belt is a polyester belt with the nominal thickness of 0.02-0.05 mm, and the width of the lapping cover of the polyester belt is not less than 5 mm;

the nominal thickness of the insulating layer is 0.3-0.6 mm, the average thickness is not less than the nominal thickness, and the thickness of the thinnest part is not less than the nominal thickness multiplied by 90-0.1 mm;

the material of the braided shielding layer is a tinned copper wire, and the braiding angle is 15-35 degrees; the single-phase coverage rate is 0.5528-0.90; the monofilament diameter of the tinned copper wire is 0.1-0.3 mm;

the nominal thickness of the outer sheath is 0.6-0.8 mm, the average thickness is not less than the nominal thickness, and the thickness of the thinnest part is not less than the nominal thickness multiplied by 85-0.1 mm.

2. The multi-core fire-resistant control cable for the motor train unit according to claim 1, wherein the pitch diameter ratio of the tinned copper wire in the conductor is 23 times, and the wire diameter is 0.243 mm.

3. The multi-core fire-resistant control cable for the motor train unit according to claim 1, wherein the wrapping layer is made of a mica tape with a cloth coating, the nominal thickness of the mica tape is 0.165mm, and the overlapping rate is 30%.

4. The multi-core fire-resistant control cable for the motor train unit as claimed in claim 1, wherein the insulation layer has a nominal thickness of 0.40 mm.

5. The multi-core fire-resistant control cable for the motor train unit as claimed in claim 1, wherein the isolation layer is formed by wrapping a polyester tape, the polyester tape has a thickness of 0.024mm, and the width of the wrapping cover is 5.5 mm.

6. The multi-core fire-resistant control cable for the motor train unit according to claim 1, wherein the braided layer is made of tinned copper wire, and the diameter of each single wire is as follows: 0.12mm, knitting angle: 25 degrees; unidirectional coverage rate: 0.70.

7. the multi-core fire-resistant control cable for the motor train unit according to claim 1, wherein the outer sheath is made of extruded low-smoke halogen-free flame-retardant sheath material, and the nominal thickness of the sheath is 0.7 mm.