Low-temperature-resistant insulated power cable

Abstract

The utility model relates to a low temperature resistant insulated power cable, which comprises a cable body, a conductor shielding structure, a filling structure and an outer protection structure, and is characterized in that a first sheath is made of a low temperature resistant polyethylene material, has better tolerance at low temperature, and plays a first-step low temperature resistant protection effect on the power cable on the inner side of the first sheath; the second sheath is adhered to the outer side of the first sheath, the second sheath is made of polyvinyl chloride, has a cold-resistant property and has a second-step cold-resistant protection effect on the power cable, and the metal tape armoring layer is extruded on the outer side surface of the flame-retardant oxygen barrier layer, so that the supporting effect of the power cable is enhanced, and the service life of the power cable is prolonged. And the outer sheath adopts halogen-free low-smoke flame-retardant polyolefin as a protective material of the outermost layer, and can tolerate in an environment of minus 40 DEG C, so that the low-temperature resistance of the power cable is enhanced, the use effect of the power cable is improved, and the service life of the power cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a low-temperature resistant insulated power cable. Background Art

[0002] Power cables are commonly used in urban underground power grids, power station lead-out lines, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. They are cables used to transmit and distribute electrical energy. They are cable products used to transmit and distribute high-power electrical energy in the trunk lines of the power system.

[0003] When optimizing the existing low-temperature resistant insulated power cables, most of them are reflected in improving the shielding properties of the power cables and extending their service life. For example, the Chinese utility model patent with application number CN201110108473.X discloses "A power cable for locomotives and rolling stock". In this power cable, a conductor, an isolation layer A, a conductor shielding layer, an insulating layer, an insulating shielding layer, an isolation layer B, a metal shielding layer, an isolation layer C, a wrapping tape, and an outer sheath are arranged from the inside to the outside, providing a power system with the advantages of high shielding, environmental protection, anti-aging, softness, etc.

[0004] Although the above-mentioned low-temperature resistant insulated power cables have certain advantages in improving the shielding properties of power cables and extending their service life, they still have certain disadvantages: power cables are used in various power consumption areas such as various urban underground power grids, power station lead-out lines, industrial and mining enterprises, etc. The use environment is different, and the power cables are required to have strong adaptability. If used in a low-temperature environment, the power cables need to have excellent low-temperature resistance in order to be used normally in a low-temperature environment. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In order to solve the above technical problems, the utility model provides a low-temperature resistant insulated power cable.

[0007] (II) Technical solution

[0008] Based on this, the utility model provides the following technical solutions: a low-temperature resistant insulated power cable, comprising a cable body, a conductor shielding structure, a filling structure and an outer protective structure, the cable body is connected through the inside of the conductor shielding structure, the filling structure is bonded to the outer periphery of the conductor shielding structure, and the outer protective structure is connected to the outer periphery of the filling structure in an annular sleeve; the cable body comprises a cable core, a copper conductor, a buffer layer and an insulating ring, the cable core is adjacent to the copper conductor and the copper conductor is located on the outer side of the cable core, the buffer layer is adhered to the outer side of the insulating ring, and the inner wall of the insulating ring is adhered to the outer periphery of the buffer layer.

[0009] Preferably, the conductor shielding structure includes a tensile-resistant outer ring, an adhesive layer, a wrapping tape and a first sheath, the adhesive layer is filled on the outer side of the tensile-resistant outer ring, the wrapping tape is annularly extruded and connected to the outer side of the adhesive layer, and the first sheath is annularly connected to the outer side of the wrapping tape.

[0010] Preferably, the filling structure includes a second sheath, an insulation tape, a soft body block and a flame retardant oxygen-insulating layer, the insulation tape is located on the outside of the second sheath, the soft body block is embedded and connected to the outer periphery of the insulation tape, and the flame retardant oxygen-insulating layer is wrapped and extruded and connected to the outside of the soft body block.

[0011] Preferably, the outer protective structure includes a metal belt armor layer, an anti-ultraviolet layer and an outer sheath, the anti-ultraviolet layer is fixed between the outer periphery of the metal belt armor layer and the inner side of the outer sheath, and the inner side surface of the outer sheath is embedded and bonded to the outer side surface of the anti-ultraviolet layer.

[0012] Preferably, the cable core passes through the middle of the conductor shielding structure, the filling structure and the outer protective structure, the copper wire passes through and is connected to the inside of the conductor shielding structure, the filling structure and the outer protective structure respectively, the buffer layer is filled on the inner side of the conductor shielding structure, the buffer layer is a filling rope, has tear resistance, and is filled between the wire cores to reduce the compressive deformation of the outer side, and the insulating ring adopts a polynitrogen insulating sleeve.

[0013] Preferably, the anti-stretching outer ring is fixed on the outside of the copper wire through a buffer layer ring. The anti-stretching outer ring is made of glass fiber material and has a pull-resistant property. The bonding layer is made of spandex fiber with excellent elasticity. The first sheath is made of low-temperature resistant polyethylene material. The cooperation between the anti-stretching outer ring and the bonding layer can make the outer sheath of the copper wire have a certain toughness, thereby improving the use effect.

[0014] Preferably, the inner wall surface of the second sheath is glued to the outer wall surface of the first sheath, the second sheath is made of cold-resistant polyvinyl chloride material, the flame retardant oxygen-isolating layer is made of halogen-free, low-smoke, highly flame retardant polyolefin material, and the soft blocks are provided with sixteen pieces, which are evenly distributed in a ring shape, and have the effect of enhancing temperature control and temperature separation.

[0015] Preferably, the inner side of the metal belt armor layer is adhesively connected to the outer side of the flame retardant oxygen insulation layer, the anti-ultraviolet layer is made of polyacrylonitrile material, which can reduce the harm of ultraviolet rays to the cable, and the outer sheath is made of halogen-free, low-smoke, flame-retardant polyolefin sheath material that can withstand minus forty degrees Celsius, has excellent low-temperature resistance, and improves the service life of the power cable.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a low-temperature resistant insulated power cable, which has the following beneficial effects:

[0018] 1. This low-temperature resistant insulated power cable twists the copper wires at each location, and the buffer layer is made of a filling rope material. The buffer layer with tear-resistant properties is filled between the copper wires to reduce the compression deformation of the outer side of the copper wire. The tensile-resistant outer ring is connected to the outer side of the insulating ring and is made of glass fiber. The filling material in the bonding layer is spandex fiber. The glass fiber with good tensile resistance and the spandex fiber with excellent elasticity cooperate with each other, so that the outer skin of the cable has a certain toughness, which has a protective effect on the power cable.

[0019] 2. This low-temperature resistant insulated power cable has a first sheath made of low-temperature resistant polyethylene material, which has good tolerance at low temperatures and plays the first step of low-temperature resistant protection for the power cable inside it. The second sheath is bonded to the outside of the first sheath and is made of polyvinyl chloride material, which has cold-resistant properties and plays the second step of cold-resistant protection for the power cable. The metal belt armor layer is extruded on the outer side of the flame retardant oxygen insulation layer to enhance the supporting effect of the power cable. The outer sheath uses halogen-free low-smoke flame retardant polyolefin as the outermost protective material, and it can withstand an environment of minus forty degrees, thereby enhancing the low-temperature resistance of the power cable, improving the use effect of the power cable and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the cable body of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the conductor shielding structure of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the filling structure of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the outer protective structure of the utility model.

[0025] In the figure: cable body -1, conductor shielding structure -2, filling structure -3, outer protective structure -4, cable core -11, copper conductor -12, buffer layer -13, insulating ring -14, tensile outer ring -21, adhesive layer -22, wrapping tape -23, first sheath -24, second sheath -31, thermal insulation tape -32, soft block -33, flame retardant oxygen isolation layer -34, metal tape armor layer -41, anti-ultraviolet layer -42, outer sheath -43. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-2 A low temperature resistant insulated power cable comprises a cable body 1, a conductor shielding structure 2, a filling structure 3 and an outer protective structure 4, wherein the cable body 1 is connected to the inside of the conductor shielding structure 2, the filling structure 3 is bonded to the outer periphery of the conductor shielding structure 2, and the outer protective structure 4 is connected to the outer periphery of the filling structure 3 in an annular sleeve; the cable body 1 comprises a cable core 11, a copper conductor 12, a buffer layer 13 and an insulating ring 14, the cable core 11 and the copper conductor 12 are arranged adjacent to each other and the copper conductor 12 is located on the outer side of the cable core 11, and the buffer layer 13 is bonded to the outer periphery of the filling structure 3; On the outer side of the insulating ring 14, the inner wall of the insulating ring 14 is adhered to the outer periphery of the buffer layer 13, the cable core 11 passes through the middle of the conductor shielding structure 2, the filling structure 3 and the outer protective structure 4, and the copper wire 12 passes through and is connected to the inside of the conductor shielding structure 2, the filling structure 3 and the outer protective structure 4 respectively. The buffer layer 13 is filled on the inner side of the conductor shielding structure 2. The buffer layer 13 is a filling rope with tear resistance. It is filled between the wire cores to reduce the compressive deformation of the outer side. The insulating ring 14 adopts a polynitrogen insulating sleeve.

[0028] See also Figure 3-4A low temperature resistant insulated power cable, the conductor shielding structure 2 comprises an anti-stretching outer ring 21, an adhesive layer 22, a wrapping tape 23 and a first sheath 24, the adhesive layer 22 is filled on the outer side of the anti-stretching outer ring 21, the wrapping tape 23 is annularly extruded and connected to the outer side of the adhesive layer 22, the first sheath 24 is annularly connected to the outer side of the wrapping tape 23, the filling structure 3 comprises a second sheath 31, an insulation tape 32, a soft block 33 and a flame retardant oxygen-isolating layer 34, the insulation tape 32 is located on the outer side of the second sheath 31, the soft block 33 is embedded and connected to the outer periphery of the insulation tape 32, the flame retardant oxygen-isolating layer 34 is wrapped and extruded and connected to the outer side of the soft block 33, the anti-stretching outer ring 21 passes through the buffer layer 13 The fixed ring is sleeved on the outside of the copper conductor 12, the tensile strength outer ring 21 is made of glass fiber material and has the property of pulling resistance, the bonding layer 22 is made of spandex fiber and has excellent elasticity, the first sheath 24 is made of low-temperature resistant polyethylene material, the cooperation between the tensile strength outer ring 21 and the bonding layer 22 can make the outer sheath of the copper conductor 12 have a certain toughness, thereby improving the use effect, the inner wall surface of the second sheath 31 is glued to the outer wall surface of the first sheath 24, the second sheath 31 is made of cold-resistant polyvinyl chloride material, the flame retardant oxygen insulation layer 34 is a halogen-free, low-smoke, highly flame-retardant polyolefin material, and the soft blocks 33 are provided with sixteen pieces, which are evenly distributed in a ring shape, and have the effect of strengthening temperature control and temperature separation.

[0029] See also Figure 5 , an insulated power cable resistant to low temperatures, the outer protective structure 4 includes a metal belt armor layer 41, an anti-ultraviolet layer 42 and an outer sheath 43, the anti-ultraviolet layer 42 is fixedly located between the outer periphery of the metal belt armor layer 41 and the inner side of the outer sheath 43, the inner side of the outer sheath 43 is embedded and adhered to the outer side of the anti-ultraviolet layer 42, the inner side of the metal belt armor layer 41 is adhered to the outer side of the flame retardant oxygen isolation layer 34, the anti-ultraviolet layer 42 is made of polyacrylonitrile material, which can reduce the harm of ultraviolet rays to this cable, the outer sheath 43 adopts a halogen-free low-smoke flame-retardant polyolefin sheath material that can withstand forty degrees below zero, has excellent low-temperature resistance, and improves the service life of the power cable.

[0030] In summary, the copper conductors 12 are distributed in a ring shape on the outside of the cable core 11, and the copper conductors 12 at each location are twisted to enhance the toughness of the power cable. The buffer layer 13 is made of a filling rope material, and the buffer layer 13 with tear-resistant properties is filled between the copper conductors 12 to reduce the compressive deformation of the outside of the copper conductors 12. The tensile-resistant outer ring 21 is connected to the outside of the insulating ring 14 and is made of glass fiber. The filler in the adhesive layer 22 is spandex fiber. The glass fiber with good tensile resistance and the spandex fiber with excellent elasticity cooperate with each other, so that the outer skin of the cable has a certain toughness, and both have a protective effect on the power cable. The first sheath 24 is made of low-temperature resistant polyethylene material, which has good tolerance at low temperatures, and plays the first step of low-temperature protection for the power cable on its inner side. The second sheath 31 is bonded to the outside of the first sheath 24, which is polyvinyl chloride. The olefin material has cold-resistant properties and plays a second step of cold-resistant protection for the power cable. An insulation tape 32 and a soft block 33 are provided between the second sheath 31 and the flame-retardant oxygen-isolating layer 34, so that the soft block 33 assists the entire filling structure 3 in strengthening temperature control, so that the temperature has differentiated areas, and the flame-retardant oxygen-isolating layer 34 adopts halogen-free, low-smoke, highly flame-retardant polyolefin material, so that the power cable has good flame-retardant properties. The metal belt armor layer 41 is extruded on the outer side of the flame-retardant oxygen-isolating layer 34 to enhance the supporting effect of the power cable. An anti-ultraviolet layer 42 is added to the outer side of the metal belt armor layer 41, which is made of polyacrylonitrile material to reduce the harm of ultraviolet rays to the cable. The outer sheath 43 adopts halogen-free, low-smoke, flame-retardant polyolefin as the outermost protective material, and it can withstand an environment of minus forty degrees, so that the low-temperature resistance of the power cable is enhanced, the use effect of the power cable is improved and its service life is extended.

[0031] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.

[0032] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0033] 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 insulated power cable, characterized in that: The cable comprises a cable body (1), a conductor shielding structure (2), a filling structure (3) and an outer protective structure (4), wherein the cable body (1) is connected to the inside of the conductor shielding structure (2), the filling structure (3) is bonded to the outer periphery of the conductor shielding structure (2), and the outer protective structure (4) is connected to the outer periphery of the filling structure (3) in an annular manner; The cable body (1) comprises a cable core (11), a copper conductor (12), a buffer layer (13) and an insulating ring (14); the cable core (11) and the copper conductor (12) are arranged adjacent to each other and the copper conductor (12) is located on the outer side of the cable core (11); the buffer layer (13) is adhered to the outer side of the insulating ring (14); and the inner wall of the insulating ring (14) is adhered to the outer periphery of the buffer layer (13).

2. A low temperature resistant insulated power cable according to claim 1, characterized in that: The conductor shielding structure (2) comprises an anti-stretching outer ring (21), an adhesive layer (22), a wrapping tape (23) and a first sheath (24); the adhesive layer (22) is filled on the outer side of the anti-stretching outer ring (21); the wrapping tape (23) is annularly extruded and connected to the outer side of the adhesive layer (22); and the first sheath (24) is annularly connected to the outer side of the wrapping tape (23).

3. A low temperature resistant insulated power cable according to claim 1, characterized in that: The filling structure (3) comprises a second protective sleeve (31), a heat-insulating tape (32), a soft body block (33) and a flame-retardant oxygen-isolating layer (34); the heat-insulating tape (32) is located outside the second protective sleeve (31); the soft body block (33) is embedded and connected to the outer periphery of the heat-insulating tape (32); and the flame-retardant oxygen-isolating layer (34) is wrapped and extruded and connected to the outer side of the soft body block (33).

4. The low temperature resistant insulated power cable according to claim 1, characterized in that: The outer protective structure (4) comprises a metal belt armor layer (41), an anti-ultraviolet layer (42) and an outer sheath (43); the anti-ultraviolet layer (42) is fixedly located between the outer periphery of the metal belt armor layer (41) and the inner side of the outer sheath (43); the inner side surface of the outer sheath (43) is embedded and adhered to the outer side surface of the anti-ultraviolet layer (42).

5. The low temperature resistant insulated power cable according to claim 1, characterized in that: The cable core (11) passes through the middle of the conductor shielding structure (2), the filling structure (3) and the outer protective structure (4); the copper wire (12) passes through and is connected to the inside of the conductor shielding structure (2), the filling structure (3) and the outer protective structure (4); and the buffer layer (13) is filled on the inner side of the conductor shielding structure (2).

6. A low temperature resistant insulated power cable according to claim 2, characterized in that: The anti-stretching outer ring (21) is fixedly sleeved on the outer side of the copper conductor (12) through the buffer layer (13); the anti-stretching outer ring (21) is made of glass fiber material; the bonding layer (22) is made of spandex fiber with excellent elasticity; the first sheath (24) is made of low-temperature resistant polyethylene material; the anti-stretching outer ring (21) and the bonding layer (22) cooperate with each other.

7. The low temperature resistant insulated power cable according to claim 3, characterized in that: The inner wall surface of the second sheath (31) is glued to the outer wall surface of the first sheath (24); the second sheath (31) is made of cold-resistant polyvinyl chloride material; the flame-retardant oxygen-isolating layer (34) is made of halogen-free, low-smoke, highly flame-retardant polyolefin material; sixteen soft blocks (33) are provided and are evenly distributed in a ring shape.

8. The low temperature resistant insulated power cable according to claim 4, characterized in that: The inner side of the metal belt armor layer (41) is bonded to the outer side of the flame retardant oxygen isolation layer (34), the anti-ultraviolet layer (42) is made of polyacrylonitrile material, and the outer sheath (43) is made of halogen-free, low-smoke, flame retardant polyolefin sheath material that can withstand temperatures of minus 40 degrees Celsius.

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