A low temperature resistant wire and cable suitable for high-cold areas

Abstract

The present invention provides a low-temperature resistant wire and cable suitable for high-cold areas, and relates to the field of cable technology, which includes a cable core, an outer sheath, and a double arc-shaped member. The present invention distributes three groups of cable cores in an annular array, and designs three groups of double arc-shaped members distributed in an annular array that are displaced 60° from the three groups of cable cores. The double arc-shaped member has an outward arc-shaped member and an inward arc-shaped member, and the outward arc-shaped member and the inward arc-shaped member are connected back to back, so that both the inner and outer sides of the double arc-shaped member can absorb the force of elastic extrusion deformation. When dealing with changes in the contraction / expansion state of the cable in the high-cold areas, the double arc-shaped member can better absorb the uneven force generated by the deformation, and the overall structure composed of the three groups of double arc-shaped members and the three groups of cable cores has a large resilience when the cable is bent, so as to avoid large cable corners, which may cause irreversible damage to the cable and affect the service life of the cable.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and in particular to a low-temperature resistant electric wire and cable suitable for use in high-cold areas. Background Art

[0002] Cables are conductors for transmitting electricity and are widely used in the current era of electricity. Cables generally include a cable core (conductor) and a protective layer, an insulating layer, a shielding layer, etc. arranged outside the cable core. For example, TPE (Thermoplastic Elastomer) material is used as the protective layer of the cable. In a low temperature environment, the molecular chain movement of the TPE material will slow down, resulting in an increase in its hardness and brittleness, and a decrease in elasticity and toughness, which will cause the cable protective layer to harden and break. By changing the molecular structure of the TPE material, adding a plasticizer, etc., its low temperature resistance can be effectively improved. For example, blending the TPE material with polyamide (PA) can significantly improve the heat resistance and cold resistance of the TPE material. At present, a variety of modified materials that can be used in extremely cold environments of minus 40°C have been disclosed. However, when these materials are actually applied to wires and cables, it is also necessary to fully consider the shrinkage of the cable sheath and the uneven force of the cable at the bending part, which makes the current types of low-temperature resistant wires and cables less, and the performance cannot meet specific needs. For this reason, the present invention provides a low-temperature resistant wire and cable suitable for high-cold areas. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a low-temperature resistant wire and cable suitable for high-cold areas, which solves the problem that some modified TPE materials cannot be well used in low-temperature resistant wires and cables due to the shrinkage of the cable sheath and the uneven force on the cable at the bending part.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A low-temperature resistant wire and cable suitable for use in high-cold areas, comprising a cable core and an outer sheath, wherein the cable core is provided in three groups, the three groups of cable cores are arranged in an annular array inside the outer sheath, and three groups of double arc members arranged in an annular array are arranged inside the outer sheath and staggered 60° with the three groups of cable cores;

[0006] The double arc-shaped member comprises an outward arc-shaped member and an inward arc-shaped member, the back side of the outward arc-shaped member is fixedly connected to the back side of the inward arc-shaped member, and both ends of the outward arc-shaped member and both ends of the inward arc-shaped member are fixedly connected to the inner side of the outer sheath.

[0007] Further preferably, polyethylene fillers are arranged on the inner side of the outer sheath and in four directions of the double arc-shaped member.

[0008] Further preferably, a first triangular area and a second triangular area are formed between the back surface of the outward arc-shaped member and the back surface of the inward arc-shaped member, the interior of the first triangular area is filled with a second filler, and the interior of the second triangular area is filled with a third filler;

[0009] A double-sided arched area is formed between the inner side of the outward arc-shaped piece and the inner side of the cable core, and the interior of the double-sided arched area is filled with a first filler;

[0010] A fan-shaped area is formed between the inner side of the inward arc-shaped piece and the outer sides of two adjacent cable cores, and the interior of the fan-shaped area is filled with a fourth filler.

[0011] Further preferably, the outer sheath comprises, from inside to outside, an armor layer, an insulation layer, and a modified TPE layer;

[0012] The armor layer is an annular metal sleeve;

[0013] The insulating layer is a cross-linked polyolefin layer.

[0014] Further preferably, a central triangle is provided at the center position of the three groups of cable cores.

[0015] Further preferably, the cable core comprises, from inside to outside, a conductor component, an inner protective ring, an outer protective ring, and a shielding layer;

[0016] The outer side of the inner protective ring is provided with a V-shaped opening, and the inner side of the outer protective ring is provided with a protruding piece corresponding to the V-shaped opening.

[0017] Further preferably, the inner protective ring comprises: a plurality of cylinders distributed in a circular array, a first V-shaped groove is formed on the side of the cylinder facing away from the center of the cable core, two adjacent cylinders are fixedly connected by a connector, a second V-shaped groove is formed between the two adjacent cylinders and located on the outside of the connector, a first protrusion corresponding to the first V-shaped groove is fixedly connected to the inner side of the outer protective ring, and a second protrusion corresponding to the second V-shaped groove is fixedly connected to the inner side of the outer protective ring.

[0018] Further preferably, the shielding layer is a copper leather ring, and an industrial non-woven fabric is arranged between the shielding layer and the outer protective ring.

[0019] Further preferably, the conductor assembly comprises: a central conductor and a plurality of layers of annular distributed conductor assemblies distributed in an annular array outside the central conductor, wherein the copper wires in the annular distributed conductor assemblies are arranged in a straight line or in a twisted line.

[0020] Further preferably, the thickness of the modified TPE layer is 6-8 times the thickness of the insulating layer, and a steel wire armor layer is provided between the armor layer and the insulating layer.

[0021] The present invention provides a low-temperature resistant wire and cable suitable for use in high-cold areas. It has the following beneficial effects:

[0022] 1. The present invention distributes three groups of cable cores in a circular array and designs three groups of double-arc members distributed in a circular array that are offset by 60° from the three groups of cable cores. The double-arc members include an outward arc member and an inward arc member. The outward arc member and the inward arc member are connected back to back, so that both the inner and outer sides of the double-arc member can absorb the force of elastic extrusion deformation. When responding to changes in the contraction / expansion state of the cable in high-cold areas, the double-arc member can better absorb the uneven force generated by the deformation. In addition, the overall structure formed by the three groups of double-arc members and the three groups of cable cores has greater resilience when the cable is bent, thereby avoiding large cable turning angles, causing irreversible damage to the cable, and affecting the service life of the cable.

[0023] 2. The present invention designs a cable core which includes, from the inside to the outside, a conductor assembly, an inner protective ring, an outer protective ring, and a shielding layer. The outer side of the inner protective ring is provided with a V-shaped opening, and the inner side of the outer protective ring is provided with a protruding piece corresponding to the V-shaped opening. In this way, when the inner protective ring and the outer protective ring shrink / expand (the principle of thermal expansion and contraction), the radial force between the inner protective ring and the outer protective ring will be partially converted into an axial force, and the inner protective ring and the outer protective ring will be circumferentially squeezed to ensure the stability of the overall structure of the cable core. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional schematic diagram of a low-temperature resistant wire and cable suitable for use in high-cold areas proposed by the present invention;

[0025] Figure 2 This is a cross-sectional schematic diagram of a low-temperature resistant wire and cable suitable for use in high-cold areas proposed by the present invention;

[0026] Figure 3 This is a three-dimensional distribution diagram of a double arc-shaped member of a low-temperature resistant wire and cable suitable for use in high-cold areas proposed by the present invention;

[0027] Figure 4 The present invention is a three-dimensional schematic diagram of a cable core of a low-temperature resistant wire and cable suitable for use in high-cold areas.

[0028] Among them, 1. cable core; 101. shielding layer; 102. outer protective ring; 102a. first protruding piece; 102b. second protruding piece; 103. inner protective ring; 103a. connector; 103b. cylinder; 103c. first V-shaped mouth; 104. conductor assembly; 104a. center conductor; 104b. annular distributed conductor assembly; 2. double arc-shaped piece; 201. outward arc-shaped piece; 202. inward arc-shaped piece; 3. polyethylene filler; 301. first filler; 302. second filler; 303. third filler; 304. fourth filler; 4. armor layer; 5. insulation layer; 6. modified TPE layer; 7. center triangle piece. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1:

[0031] like Figure 1-Figure 4 As shown, an embodiment of the present invention provides a low-temperature resistant wire and cable suitable for use in high-cold areas, comprising a cable core 1 and an outer sheath, the cable core 1 being located inside the outer sheath. In this solution, three groups of cable cores 1 are arranged, and the three groups of cable cores 1 are arranged in a circular array on the inner side of the outer sheath, that is, the three groups of cable cores 1 are distributed in an equilateral triangle, and three groups of double-arc components 2 distributed in an annular array are arranged inside the outer sheath and offset by 60° from the three groups of cable cores 1, and the three groups of double-arc components 2 distributed in an annular array are also distributed in an equilateral triangle.

[0032] The three groups of cable cores 1 and the three groups of double arc-shaped members 2 are staggered, and the structure they constitute can be well distributed inside the outer sheath, thereby achieving stability of the three groups of cable cores 1 and the three groups of double arc-shaped members 2.

[0033] Specifically, each double arc member 2 includes: an outward arc member 201 and an inward arc member 202. The back side of the outward arc member 201 is fixedly connected to the back side of the inward arc member 202. The outward arc member 201 and the inward arc member 202 can use long strips of metal sheets, which are processed into arc shapes by a bending process, and then the outward arc member 201 and the inward arc member 202 are welded and fixed by electric welding. Both ends of the outward arc member 201 and both ends of the inward arc member 202 are fixedly connected to the inner side of the outer sheath, that is, the four ends of the double arc member 2 are fixedly connected to the inner side of the outer sheath.

[0034] Both the inner and outer sides of the double arc-shaped member 2 can absorb the force of elastic extrusion deformation. When dealing with the changes in the contraction / expansion state of the cable in high-cold areas, the double arc-shaped member 2 can better absorb the uneven force caused by the deformation. The overall structure formed by the three groups of double arc-shaped members 2 and the three groups of cable cores 1 has greater resilience when the cable is bent, thereby avoiding large cable turning angles, causing irreversible damage to the cable and affecting the service life of the cable.

[0035] In one embodiment, polyethylene fillers 3 are disposed on the inner side of the outer sheath and in four directions of the double arc-shaped member 2. The polyethylene filler 3 is elastic and flame-retardant and is easy to fill inside the cable, and is an excellent filler.

[0036] Specifically, the polyethylene filler 3 includes a first filler 301 , a second filler 302 , a third filler 303 , and a fourth filler 304 .

[0037] A first triangular area and a second triangular area are formed between the back side of the outward arc-shaped part 201 and the back side of the inward arc-shaped part 202. The first triangular area and the second triangular area have the same shape and are mirror-symmetrical to each other. The interior of the first triangular area is filled with a second filler 302, and the interior of the second triangular area is filled with a third filler 303.

[0038] A double-sided arched area is formed between the inner side of the outward arc-shaped member 201 and the inner side of the cable core 1 , and the interior of the double-sided arched area is filled with a first filler 301 .

[0039] A fan-shaped area is formed between the inner side of the inward arc-shaped member 202 and the outer sides of two adjacent cable cores 1 , and the interior of the fan-shaped area is filled with a fourth filler 304 .

[0040] The first filler 301, the second filler 302, the third filler 303, and the fourth filler 304 work together to maintain the relative positions of the three groups of cable cores 1 and the three groups of double arc-shaped parts 2 in the outer sheath, and the polyethylene filler is elastic and flame retardant, further improving the flame retardant and extrusion resistance of the low-temperature resistant wires and cables.

[0041] In one embodiment, the outer sheath includes, from the inside to the outside, an armor layer 4, an insulation layer 5, and a modified TPE layer 6. The armor layer 4 is an annular metal sleeve, specifically an annular steel ring, and the insulation layer 5 is a cross-linked polyolefin layer. The cross-linked polyolefin material has good insulation properties, thereby ensuring that the cable has good insulation properties and avoiding the occurrence of leakage accidents.

[0042] In one embodiment, a central triangle piece 7 is provided at the center position of the three groups of cable cores 1. The three sides of the central triangle piece 7 can be designed to be arc-shaped, corresponding to the centers of the three groups of cable cores 1. The central triangle piece 7 can be used to position the three groups of cable cores 1, and also to fill the space area in the center of the three groups of cable cores 1. The material of the central triangle piece 7 can be polyethylene material, and a tensile steel wire (not shown in the drawings) can be embedded in the center of the central triangle piece 7 to further improve the tensile performance of low-temperature resistant wires and cables.

[0043] In one embodiment, the cable core 1 includes, from inside to outside, a conductor component 104 , an inner protective ring 103 , an outer protective ring 102 , and a shielding layer 101 .

[0044] The outer side of the inner protective ring 103 is provided with a V-shaped opening, and the inner side of the outer protective ring 102 is provided with a protruding piece corresponding to the V-shaped opening.

[0045] The cable core includes a conductor assembly, an inner protective ring, an outer protective ring, and a shielding layer from the inside to the outside. A V-shaped opening is arranged on the outside of the inner protective ring, and a protrusion corresponding to the V-shaped opening is arranged on the inside of the outer protective ring. In this way, when the inner protective ring 103 and the outer protective ring 102 shrink / expand (the principle of thermal expansion and contraction), the radial force between the inner protective ring 103 and the outer protective ring 102 will be partially converted into an axial force, and the inner protective ring 103 and the outer protective ring 102 are circumferentially squeezed to ensure the stability of the overall structure of the cable core;

[0046] For example, the inner protective ring shrinks inwards and fits tightly against the cable core 1, and the cable core 1 (copper wire or aluminum wire, whose thermal expansion and contraction effect is not obvious) basically does not shrink, and the deformation of the inner protective ring 103 is concentrated at the outer V-shaped mouth. The outer protective ring 102 shrinks inwards to squeeze the inner protective ring 103, and the V-shaped mouth and protrusion matching structure designed between the inner protective ring 103 and the outer protective ring 102 will make the inner protective ring 103 and the outer protective ring 102 fit tightly.

[0047] In one embodiment, the inner protective ring 103 includes: a plurality of cylinders 103b distributed in a ring array, a first V-shaped groove 103c is provided on a side of the cylinder 103b away from the center of the cable core 1, two adjacent cylinders 103b are fixedly connected by a connector 103a, a second V-shaped groove is formed between the two adjacent cylinders 103b and on the outside of the connector 103a, a first protruding piece 102a corresponding to the first V-shaped groove 103c is fixedly connected to the inner side of the outer protective ring 102, a second protruding piece 102b corresponding to the second V-shaped groove is fixedly connected to the inner side of the outer protective ring 102, and the part of the cylinder 103b protruding inwardly from the connector 103a forms an arc-shaped protrusion, which contacts and cooperates with the conductor component 104.

[0048] By designing the matching structure between the first V-shaped groove 103c and the first protruding piece 102a, and the matching structure between the second V-shaped groove and the second protruding piece 102b, the inner protective ring and the outer protective ring can match more closely, especially when the inner protective ring 103 and the outer protective ring 102 are subjected to uneven force, the inner protective ring 103 and the outer protective ring 102 can match closely.

[0049] In one embodiment, the shielding layer 101 is a copper ring with a thickness of about 2-5 MM. An industrial non-woven fabric is arranged between the shielding layer 101 and the outer protective ring 102. The industrial non-woven fabric fills the gaps in the cable to improve the waterproof performance and mechanical stability of the cable.

[0050] In one embodiment, the conductor assembly 104 includes: a central conductor 104a and a plurality of layers of annular distributed conductor assemblies 104b distributed in an annular array outside the central conductor 104a, such as Figure 4 The annular distributed conductor assembly 104b shown in the figure is provided with two layers, inner and outer layers, and the copper wires in the annular distributed conductor assembly 104b are arranged in straight lines or in twisted lines.

[0051] In one embodiment, the thickness of the modified TPE layer 6 is 6-8 times the thickness of the insulating layer 5 , and a steel wire armor layer is provided between the armor layer 4 and the insulating layer 5 .

[0052] The material of the modified TPE layer is modified TPE; for example, by changing the molecular structure of the TPE material, adding plasticizers and other methods, its low temperature resistance is effectively improved, the glass transition temperature of the TPE material is reduced, and its low temperature resistance is improved; for example, blending the TPE material with polyamide can also significantly improve the heat resistance and cold resistance of the TPE material.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low temperature resistant wire and cable suitable for use in cold regions, comprising a cable core (1) and an outer sheath, characterized in that: The cable cores (1) are provided in three groups, the three groups of cable cores (1) are arranged in a circular array on the inner side of the outer sheath, and three groups of double arc-shaped members (2) arranged in a circular array are arranged inside the outer sheath and offset by 60° from the three groups of cable cores (1); The double arc-shaped member (2) comprises: an outward arc-shaped member (201) and an inward arc-shaped member (202), the back surface of the outward arc-shaped member (201) being fixedly connected to the back surface of the inward arc-shaped member (202), and both ends of the outward arc-shaped member (201) and both ends of the inward arc-shaped member (202) being fixedly connected to the inner side of the outer sheath; The cable core (1) comprises, from the inside to the outside, a conductor component (104), an inner protective ring (103), an outer protective ring (102), and a shielding layer (101); The outer side of the inner protective ring (103) is provided with a V-shaped opening, and the inner side of the outer protective ring (102) is provided with a protruding piece corresponding to the V-shaped opening; The inner protective ring (103) comprises: a plurality of cylinders (103b) distributed in an annular array, a first V-shaped opening (103c) being provided on a side of the cylinder (103b) facing away from the center of the cable core (1), two adjacent cylinders (103b) being fixedly connected via a connector (103a), a second V-shaped opening being formed between the two adjacent cylinders (103b) and located outside the connector (103a), a first protruding piece (102a) corresponding to the first V-shaped opening (103c) being fixedly connected to the inner side of the outer protective ring (102), and a second protruding piece (102b) corresponding to the second V-shaped opening being fixedly connected to the inner side of the outer protective ring (102).

2. The low temperature resistant wire and cable suitable for high-cold areas according to claim 1, characterized in that: Polyethylene fillers (3) are arranged on the inner side of the outer sheath and in four directions of the double arc-shaped member (2).

3. The low temperature resistant wire and cable suitable for use in cold regions according to claim 2, characterized in that: A first triangular area and a second triangular area are formed between the back surface of the outward arc-shaped piece (201) and the back surface of the inward arc-shaped piece (202), the interior of the first triangular area is filled with a second filler (302), and the interior of the second triangular area is filled with a third filler (303); A double-sided arched area is formed between the inner side of the outward arc-shaped piece (201) and the inner side of the cable core (1), and the interior of the double-sided arched area is filled with a first filler (301); A fan-shaped area is formed between the inner side of the inward arc-shaped piece (202) and the outer sides of two adjacent cable cores (1), and the interior of the fan-shaped area is filled with a fourth filler (304).

4. The low temperature resistant wire and cable suitable for use in cold regions according to claim 1, characterized in that: The outer sheath comprises, from the inside to the outside, an armor layer (4), an insulating layer (5), and a modified TPE layer (6); The armor layer (4) is an annular metal sleeve; The insulating layer (5) is a cross-linked polyolefin layer.

5. The low temperature resistant wire and cable suitable for high-cold areas according to claim 4, characterized in that: A central triangle (7) is provided at the center position of the three groups of cable cores (1).

6. The low temperature resistant wire and cable suitable for use in cold regions according to claim 5, characterized in that: The shielding layer (101) is a copper leather ring, and industrial non-woven fabric is provided between the shielding layer (101) and the outer protective ring (102).

7. The low temperature resistant wire and cable suitable for use in cold regions according to claim 6, characterized in that: The conductor assembly (104) comprises: a central conductor (104a) and a plurality of layers of annular distributed conductor assemblies (104b) distributed in an annular array outside the central conductor (104a); the copper wires in the annular distributed conductor assemblies (104b) are arranged in a straight line or in a twisted line.

8. The low temperature resistant wire and cable suitable for use in cold regions according to claim 7, characterized in that: The thickness of the modified TPE layer (6) is 6 to 8 times the thickness of the insulating layer (5), and a steel wire armor layer is provided between the armor layer (4) and the insulating layer (5).

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