CN216353543U - Anti-aging voltage-resistant power cable - Google Patents
Anti-aging voltage-resistant power cable Download PDFInfo
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- CN216353543U CN216353543U CN202123054580.7U CN202123054580U CN216353543U CN 216353543 U CN216353543 U CN 216353543U CN 202123054580 U CN202123054580 U CN 202123054580U CN 216353543 U CN216353543 U CN 216353543U
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Abstract
The utility model relates to the technical field of power cables, and particularly provides an anti-aging pressure-resistant power cable which comprises a conductor unit, wherein the conductor unit comprises a support framework and four conductors, and the four conductors are twisted on the outer side of the support framework and are wound by a wrapping tape layer together with filling ropes distributed on the outer side of the support framework to form a circular section; the outer wall of the conductor is coated with a heat conducting layer for reducing heat generated by the cable core during working. The aging voltage-resistant power cable provided by the utility model not only ensures the insulation shielding performance of the cable, but also has better compression resistance and aging resistance.
Description
Technical Field
The utility model relates to the technical field of power cables, in particular to an anti-aging voltage-resistant power cable.
Background
The cable is used for transmitting electric energy, information and wire products for realizing electromagnetic energy conversion, the generalized electric wire and cable is also called as cable for short, and the narrow cable is insulated cable. With the advancement of society, power cables are often present in our lives and are an important partner in our lives and work.
However, after a period of use, the wire may be damaged by aging or broken by external force, and especially, when the cable is operated in overload for a long time, the aging of the insulation is accelerated by an excessively high temperature, so that the insulation is broken. In hot summer or in an environment with high hot temperature, the temperature rise of the cable often causes the first breakdown of the weak insulation part of the cable and even the occurrence of fire, so that potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides an anti-aging voltage-resistant power cable, which comprises:
a conductor unit;
the conductor unit comprises a support framework and four conductors, wherein the four conductors are stranded on the outer side of the support framework and are wound by a belting layer together with filling ropes distributed on the outer side of the support framework to form a circular section;
the flame-retardant layer is wrapped on the outer wall of the conductor unit;
the outer sheath is extruded on the outer wall of the flame-retardant layer;
the outer wall of the conductor is coated with a heat conduction layer, and the heat conduction layer is a heat conduction coating formed by coating a high-heat-conductivity backfill material and used for reducing heat generated by the cable core during operation;
the supporting framework is arranged to be a rubber layer with a section of a square star shape, the four conductors are arranged at four corners of the supporting framework in an axisymmetric distribution mode and used for absorbing extrusion acting force through self elastic deformation when the external extrusion impact acting force is received, and therefore mutual extrusion between the conductors is relieved.
Preferably, the thickness of the heat-conducting coating is 0.5-0.8 mm.
Preferably, the conductor comprises a lead frame and two conducting cores, the lead frame is in an I shape, the two conducting cores are distributed on two sides of the lead frame and are wrapped by the polyester tape together with the filling layer distributed on the outer side of the lead frame to form an oval section.
Preferably, the guide core is formed by stranding a plurality of oxygen-free copper wires with the diameter of 1mm-2 mm.
Preferably, the outer wall of the guide core is extruded and wrapped with three co-extrusion layers, namely a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside in sequence.
Preferably, the flame-retardant layer is a mica tape wrapping layer, and the thickness of the flame-retardant layer is 0.3mm-0.5 mm.
Preferably, the outer sheath is a double-layer complementary sheath layer, the inner layer is a flame-retardant polyolefin layer, and the outer wall of the flame-retardant polyolefin layer is extruded with a PVC layer.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure of a conductor unit according to an embodiment of the present invention;
FIG. 3 is an axial view of a support frame according to an embodiment of the present invention;
fig. 4 is a diagram illustrating a mounting structure of a conductor and a lead frame according to an embodiment of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the utility model. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
The aging of the cable can be caused by the cable overload heating, the sunshine (especially ultraviolet rays), the change range of the environmental temperature, the heat dissipation condition of the cable, the corrosion of the contacted atmosphere and environmental chemical substances and the like, wherein the insulation and the outer sheath of the cable are aged, the cable is accelerated due to the cable overload, the temperature rise and the continuous high temperature in use, the insulation aging of the cable is caused, the dielectric strength of the cable is reduced, and therefore, the cable can be subjected to insulation breakdown, the short circuit or spontaneous combustion of a line is caused, and the electric safety accident is easily caused. Based on the problem, the utility model provides the anti-aging and voltage-resistant power cable which not only ensures the insulation shielding performance of the cable, but also has better compression resistance and aging resistance.
As shown in fig. 1 to 4, the aging-resistant and voltage-resistant power cable according to the exemplary embodiment of the present invention may be applied to a power cable with a high ambient temperature, a long sunshine period, and a poor laying environment, especially a power cable in a high-altitude area. In the example shown in fig. 1, the aging-resistant and voltage-resistant power cable includes a conductor unit 1 constituting power transmission. As shown in fig. 2, the conductor unit 1 includes a supporting frame 11 and four conductors 12, and the four conductors 12 are twisted on the outer side of the supporting frame 11 and wound with a wrapping layer 14 together with a filling cord 13 distributed on the outer side thereof to have a circular cross section.
Because power cable is the cable that is used for transmission and distribution electric energy, the laying environment is comparatively complicated, under some special environment, need wear the wall or make somebody a mere figurehead to lay, at the laying process and lay after, all can cause the extrusion to the cable, and when power cable was extruded, must lead to the fact the extrusion to the cable core to cause the influence to power transmission quality. In the present example, the supporting frame 11 is provided in a frame shape configured by a rubber layer having a cross section of a "four-pointed star" shape, and four conductors 12 are provided at four corners of the supporting frame 11 in an axisymmetric distribution. The rubber is a high-elasticity polymer material with reversible deformation, is rich in elasticity at room temperature, can generate large deformation under the action of small external force, can recover the original shape after the external force is removed, and has good elasticity and deformation, and the four conductors 12 are arranged in a separated mode through the supporting framework 11 in the shape of a 'quadrangle star'.
So, receive the exogenic action at the cable, conductor 12 all inwards extrudees so that support chassis 11 takes place deformation, and deformation through support chassis 11 disperses pressure, has the function of absorption deformation, plays certain cushioning effect.
With reference to fig. 1, the four conductors 12 are separated by the supporting frame 11, so that mutual extrusion between the conductors 12 is alleviated, and damage to the conductors 12 caused by extrusion is avoided.
Referring to fig. 1, 2 and 4, in an alternative embodiment, the conductor 12 includes a lead frame 121 and two conductive cores 122, the lead frame 121 is "i" shaped, and the two conductive cores 122 are distributed on two sides of the lead frame 121 and wrapped by a polyester tape 124 together with a filling layer 123 distributed on the outer side thereof to have an oval cross section.
Further, the guide core 122 is formed by twisting a plurality of oxygen-free copper flexible copper wires with the diameter of 1mm-2 mm.
Specifically, the outer wall of the conductive core 122 is sequentially wrapped with a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside in a three-layer co-extrusion manner. The insulating layer adopts crosslinked polyethylene, has good insulating properties, and conductor shielding layer and insulating shielding layer all adopt super-clean semi-conductive shielding material to make, can effectively derive the electric current, still has super smooth surface characteristic, and its stable performance can play the effect of good even electric field, and the space charge that restraines in the cable insulation material is gathered and is reduced its conductivity, has good shielding effect.
In a preferred embodiment, in order to avoid the damage of the conductive core 122 caused by the external pressing force, the lead frame 121 is prefabricated in an i shape by using a rigid plastic material, two conductive cores 122 are respectively disposed on two sides of the lead frame 121, and are separated by the lead frame 121 and wrapped inside the lead frame 121, and the rigid plastic material has good supporting stability and pressure resistance. Thus, in combination with the supporting skeleton 11, the continuous pressure received by the conductive core 122 of the conductor is relieved when the cable is subjected to external compression forces.
Further, the filling layer 123 is made of ceramic fiber wool, and has excellent fire resistance.
The polyester tape 124 is made of PTFE material, adopts a transverse winding mode, has the advantages of small thickness, light weight, high flexibility, good corrosion resistance and good tensile strength, and thus, the solid conductor 12 wound by the polyester tape 124 is not easy to loosen and the cable roundness is ensured.
In an alternative embodiment, the filling rope 13 is a reinforced tensile fiber rope, which has good tensile property and flexibility.
The 14 polypropylene materials foaming of band layer adopts the mode of horizontal package of rolling up, and inside forms a plurality of bubbles, and band hardness reduces, makes the cable more soft, bends easily, and a plurality of bubbles play stress cushioning effect when the cable receives the extrusion, and the compliance is high.
Since the current carrying capacity of a power cable is generally related to the sectional area of a conductor core, when the current is increased, the temperature of the conductor 12 is increased, and when the temperature of an insulating layer coated outside the conductor 12 exceeds an upper limit, the performance of the insulating layer is changed, the aging speed of the insulating layer is accelerated, the insulation of the cable is aged, the dielectric strength of the cable is reduced, and therefore insulation breakdown can be caused, and the cable is short-circuited or self-ignited.
In a preferred embodiment, shown in fig. 1 and 2, in order to rapidly reduce the heat generated during the operation of the cable core and prevent the cable insulation from being aged too early in a high-temperature environment, the outer wall of the conductor 12 is coated with a heat-conducting layer 2. In an alternative embodiment, the heat conducting layer 2 may be a heat conducting coating in the prior art, for example, a high heat conducting backfill material (such as a high heat conducting backfill material prepared from calcium oxide, polyvinyl acetate adhesive, water and sodium silicate) is coated on the outer wall of the conductor 12 in a continuous production process, and is coated on the outer wall of the conductor 12 after being rapidly solidified, so that the lower heat resistance around the cable can be maintained for a long time, the heat resistance ratio is small, and the heat dissipation performance is good.
Referring to fig. 1, in order to improve the flame retardant performance of the cable, a flame retardant layer 3 is wrapped around the outer wall of the conductor unit 1.
Furthermore, the flame-retardant layer 3 is formed by wrapping mica tapes, has the thickness of 0.3-0.5mm, and is high-temperature-resistant and flame-retardant.
As shown in fig. 1, the outer wall of the flame retardant layer 3 is extruded with an outer sheath 4.
Further, the outer sheath 4 comprises a double-layer co-extrusion sheath layer, the inner layer is a flame-retardant polyolefin layer, the outer wall of the flame-retardant polyolefin layer is extruded with a PVC layer, the polyolefin has good insulation and flame retardance, and the PVC has good tensile property, wear resistance and insulation.
In combination with the above embodiments, the support frame 11 in the shape of a "quadrangle star" formed by extrusion molding and the conductors 12 arranged at the corners of the support frame 11 are separated from each other by the support frame 11, so that when an external force is applied, the conductors 12 are extruded inwards to deform the support frame 11 made of rubber, and absorb or disperse the acting force, and the heat conduction layer 2 formed by a high-thermal-conductivity backfill material is further coated on the outer wall of the conductors 12, so that the operation temperature of the conductors 12 can be reduced, the current-carrying capacity of the cable can be improved, and the cable can be prevented from being aged too early in a high-temperature environment, and the filling layer 123, the flame-retardant layer 3 and the flame-retardant sheath layer are combined, so that the cable has good heat dissipation and flame retardance.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (8)
1. An ageing-resistant and pressure-resistant power cable is characterized by comprising:
a conductor unit;
the conductor unit comprises a supporting framework and a plurality of conductors, wherein the plurality of conductors are stranded on the outer side of the supporting framework and are wound into a circular section by a wrapping layer together with filling ropes distributed on the outer side of the supporting framework to form a cable;
the flame-retardant layer is wrapped on the outer wall of the conductor unit;
the outer sheath is extruded on the outer wall of the flame-retardant layer;
the conductor comprises a lead frame and two guide cores, wherein the lead frame is in an I shape, the two guide cores are distributed on two sides of the lead frame and are wrapped into an oval cross section shape by a polyester tape together with a filling layer distributed on the outer side of the lead frame;
the supporting framework is set to be of a framework structure with a quadrangular cross section, and the four conductors are arranged at four corners of the supporting framework in an axisymmetric manner and are set to be capable of buffering the pressure applied to the conductors through elastic deformation of the conductors.
2. The anti-aging, voltage-withstand power cable according to claim 1, wherein an outer wall of the conductor is coated with a thermally conductive coating.
3. The anti-aging voltage-withstand power cable according to claim 2, wherein the thickness of the thermally conductive coating is 0.5mm to 0.8 mm.
4. The aging-resistant and voltage-resistant power cable according to claim 1, wherein the supporting frame is in a frame shape constructed by a rubber layer.
5. The anti-aging pressure-resistant power cable as claimed in claim 1, wherein the conductive core is formed by stranding a plurality of oxygen-free copper wires with the diameter of 1mm-2 mm.
6. The anti-aging voltage-resistant power cable according to claim 1, wherein the outer wall of the conductive core is extruded with three co-extruded layers, namely a conductor shielding layer, an insulating layer and an insulating shielding layer in sequence from inside to outside.
7. The anti-aging voltage-resistant power cable according to claim 1, wherein the flame-retardant layer is a mica tape wrapping layer, and the thickness of the mica tape wrapping layer is 0.3mm-0.5 mm.
8. The anti-aging pressure-resistant power cable according to any one of claims 1 to 7, wherein the outer sheath is a double-layer complementary sheath layer, the inner layer is a flame-retardant polyolefin layer, and the outer wall of the flame-retardant polyolefin layer is extruded with a PVC layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123054580.7U CN216353543U (en) | 2021-12-07 | 2021-12-07 | Anti-aging voltage-resistant power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123054580.7U CN216353543U (en) | 2021-12-07 | 2021-12-07 | Anti-aging voltage-resistant power cable |
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| Publication Number | Publication Date |
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| CN216353543U true CN216353543U (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123054580.7U Active CN216353543U (en) | 2021-12-07 | 2021-12-07 | Anti-aging voltage-resistant power cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577892A (en) * | 2023-07-14 | 2023-08-11 | 江苏永鼎股份有限公司 | Butterfly-shaped lead-in optical cable with embedded structure |
-
2021
- 2021-12-07 CN CN202123054580.7U patent/CN216353543U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577892A (en) * | 2023-07-14 | 2023-08-11 | 江苏永鼎股份有限公司 | Butterfly-shaped lead-in optical cable with embedded structure |
| CN116577892B (en) * | 2023-07-14 | 2023-09-08 | 江苏永鼎股份有限公司 | Butterfly-shaped lead-in optical cable with embedded structure |
| WO2025015682A1 (en) * | 2023-07-14 | 2025-01-23 | 江苏永鼎股份有限公司 | Bow-type drop cable having insertion structure |
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