CN216353414U - Insulated low-voltage cable - Google Patents

Abstract

The utility model relates to the technical field of cables, in particular to an insulated low-voltage cable, which comprises: strengthen the core, around covering, electrically conductive unit, heat absorption strip, elasticity filler strip, outer insulating layer, armor and oversheath. The conductive units are respectively positioned in three cavities surrounded by the reinforced core and the wrapping layer. The plurality of elastic filling strips are respectively filled in a cavity formed by the wrapping layer and the reinforcing core; the heat absorbing strips comprise a coating structure, wherein hollow cavities are formed in the coating structure, the hollow cavities are used for containing and filling heat absorbing media, and the hollow cavities of each heat absorbing strip are independently arranged. According to the insulated low-voltage cable, the flexible thin-wall coating structure and the central supporting layer inside are added through optimizing the structural design, so that the flexibility and the strength of the cable are improved, the heat transfer efficiency of the cable is improved, the heat conduction area is increased under the condition of small-space use, the temperature rise of the cable is reduced, and the aging and breakdown of the insulating layer caused by the fact that the electric conduction unit is in an overheated state for a long time are prevented.

Description

Insulated low-voltage cable

Technical Field

The utility model relates to the technical field of wires and cables, in particular to an insulated low-voltage cable.

Background

The electric wire cable is a transmission medium covered with an insulating layer, a protective layer, a shielding layer and the like for transmitting electric power or signal current and signal voltage, and can be generally divided into a medium-high voltage cable and a low-voltage cable, and the low-voltage cable has the characteristics of reliable operation, small influence by the outside and the like, is widely applied to a low-voltage power distribution system, and is generally used in the fields of electrical equipment and electromechanical machines.

At present, the equal mutual butt of multiunit conductive core of low tension cable, when carrying out signal of telecommunication connection between relative motion's arm, along with the relative motion of arm, the cable takes place a certain amount of buckling and twists reverse according to the running state of arm, when twisting, the continuous heat that produces of mutual friction between the multiunit conductive core, conductive core itself also can continuously produce the heat when electrically conducting, make conductive core's insulating layer be in overheated state for a long time, cause the insulating layer ageing damage easily, thereby lead to insulation breakdown.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides an extruded insulated low-voltage cable, which comprises:

the cross section of the reinforced core is Y-shaped;

the wrapping layer is wrapped on the outer side wall of the reinforcing core;

the conductive units are respectively positioned in three cavities surrounded by the reinforcing core and the wrapping layer;

the heat absorbing strips are arranged on the three V-shaped edges of the reinforcing core in a centrosymmetric manner;

the filling strips are arranged in one-to-one correspondence with the conductive units;

the outer insulating layer is coated on the outer side wall of the wrapping layer;

the armor layer is coated on the outer side wall of the outer insulating layer;

the outer sheath is coated on the outer side wall of the armor layer;

the filling strips are elastic filling strips, and a plurality of elastic filling strips are respectively filled in three cavities formed by the wrapping layer and the reinforcing core;

the heat absorption strip comprises a coating structure, a hollow cavity is formed in the coating structure, the hollow cavity of the coating structure is used for containing and filling heat absorption media, and the hollow cavity of each heat absorption strip is independently arranged

Preferably, the coating structure is a thin-wall structure, and the wall thickness is 0.2-0.5 mm.

Preferably, the elastic filling strips are heat-conducting silicon rubber filling strips.

Preferably, the armor is a steel wire armor.

Preferably, the conductive unit comprises a wire core, an inner shielding layer, an inner insulating layer, an outer shielding layer and a lubricating layer which are sequentially distributed from inside to outside.

Preferably, the lubricating layer is a polytetrafluoroethylene layer.

Preferably, the outer insulating layer is a polyethylene layer.

Preferably, semiconductive nylon tapes are adopted for both the inner shield layer and the outer shield.

Compared with the prior art, the utility model has the advantages that:

according to the insulated low-voltage cable, the flexible thin-wall coating structure and the central supporting layer are added through optimizing the structural design, so that the flexibility and the strength of the cable are improved, the heat transfer efficiency of the cable can be improved, the heat conduction area is increased under the condition of small-space use, and the self-cooling is realized.

Especially when the cable is applied to an industrial robot, when multiple strands of cables need to be bundled together or wires need to be wound and twisted, three groups of conductive units are twisted mutually along the axial direction of the cable, the elastic filling strips perform elastic buffering on the conductive units and cling to and extrude the flexible coating structures at corresponding positions, the elastic filling strips play a role in buffering, the heat transfer area of the conductive units is increased, the heat transfer efficiency is accelerated, meanwhile, heat generated by the conductors is transferred into cavities inside the conductors through the coating structures, heat absorbing materials such as phase change materials or heat storage materials (such as phase change heat absorbing wax and the like) can be filled in the cavities, the temperature rise of the cable is reduced, and the phenomenon that the insulating layers are aged and punctured due to the fact that the conductive units are in an overheated state for a long time is prevented.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the inventive subject matter of this disclosure.

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

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural view of an insulated low-voltage cable according to the present invention;

fig. 2 is a schematic view of the structure of a heat sink strip of an insulated low voltage cable according to the utility model;

fig. 3 is a schematic view of the structure of the conductive element of the insulated low-voltage cable according to the utility model;

fig. 4 is an enlarged schematic view at a in fig. 1.

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.

Because the multiple groups of conductive wire cores of the existing extruded insulation low-voltage cable are mutually abutted, when the cable is applied to the mechanical arms which move relatively, along with the relative movement of the mechanical arms, the cable is bent and twisted in a certain amount according to the running state of the mechanical arms, heat is continuously generated by mutual friction among the multiple groups of conductive wire cores during twisting, and the conductive wire cores continuously generate heat during conduction, so that the insulation layer of the conductive wire cores is in an overheat state for a long time, the insulation layer is easy to age, and insulation breakdown is caused.

Referring to fig. 1, 3 and 4, the insulated low-voltage cable provided by the utility model comprises a reinforced core 1, a wrapping layer 3, a conductive unit 2, a heat absorbing strip 4, an elastic filling strip 5, an outer insulating layer 6, an armor layer 7 and an outer sheath 8.

The section of the reinforced core 1 is Y-shaped, and the three conductive units 2 are separated to prevent mutual interference.

In an optional embodiment, the reinforcing core 1 is made of nylon, and has the characteristics of good toughness, strong wear resistance, good tensile and bending strength and good dimensional stability.

As shown in fig. 3, the conductive unit 2 includes a wire core 21, an inner shield layer 22, an inner insulating layer 23, an outer shield 24 and a lubricating layer 25, which are sequentially distributed from inside to outside.

In an alternative embodiment, the wire core 21 is stranded via several strands of galvanized copper wire.

The inner shield layer 22 and the outer shield 24 both adopt semiconductive nylon tapes as conductor insulation for shielding electromagnetic signals and ensuring that the adjacent wire cores 21 are not interfered.

The inner insulating layer 23 is made of cross-linked polyethylene material, which has excellent mechanical property and electrical insulating property and plays a good insulating role.

The lubricating layer 25 is made of a polytetrafluoroethylene film, the friction coefficient is low, and the friction force can be effectively reduced through the lubricating layer 25, so that the friction heating value is reduced.

Further, around covering 3, adopt the polyester area, the cladding is at the lateral wall of strengthening core 1, and three electrically conductive unit 2 is located respectively and strengthens core 1 and around the three cavity that covering 3 encloses.

In an optional embodiment, the wrapping layer 3 is wrapped by using a fire-resistant mica tape, so that the fire-resistant mica tape has good fire-resistant insulating property, basically does not volatilize harmful smoke when burning in open fire, and is safe and environment-friendly.

Referring to fig. 1 and 2, three heat absorbing strips 4 are arranged on three V-shaped edges of the reinforced core 1 in a central symmetry manner, and three elastic filling strips 5 are respectively filled in three cavities formed by the wrapping layer 3 and the reinforced core 1.

Wherein the heat absorbing strip 4 comprises a cladding structure 41 with a hollow cavity formed therein. As shown in fig. 1, the hollow cavities of each heat absorbing strip are independently arranged and are not communicated with each other.

Furthermore, the cladding structure 41 is a thin-wall cladding structure 41, and the wall thickness is 0.2-0.5mm, so that the cladding structure 41 has good elasticity, and the reduction of elastic deformation capability caused by excessively thick wall thickness is prevented.

In an alternative embodiment, the cladding structure 41 is made of heat-conducting silicone rubber, which has good heat-conducting property, and has good heat-conducting effect while ensuring good elasticity.

In the cable preparation process, the hollow cavity of the coating structure 41 is used for containing a heat absorption material 42, especially a phase change material or a heat storage material (such as phase change heat absorption wax, etc., which has high energy storage density and high efficiency), so that the temperature rise of the cable is reduced, and the insulating layer is prevented from being aged and broken down due to the fact that the conductive unit is in an overheat state for a long time.

Furthermore, the elastic filling strips 5 are elastic heat conducting filling strips, which need to have good heat conducting performance while playing a role of elastic buffering, and conduct heat on the conductive unit 2 to the cladding structure 41, so as to provide a larger heat conducting area.

In an alternative embodiment, the elastic filling strips 5 are made of heat-conducting silicone rubber, and have a good heat-conducting property while playing a role in buffering.

With reference to fig. 1 and 4, the outer insulating layer 6 is wrapped around the outer side wall of the wrapping layer 3 in an extruding manner, the armor layer 7 is wrapped on the outer side wall of the outer insulating layer 6, and the outer sheath 8 is wrapped on the outer side wall of the armor layer 7.

Further, the outer insulating layer 6 is an extruded polyethylene layer, has good insulating property and low temperature resistance, and is suitable for complex processing environments of industrial robots.

The armor layer 7 is a steel wire armor layer and can bear longitudinal tension.

The outer sheath 8 is made of flame-retardant PVC material or other wear-resistant flame-retardant materials and is wrapped on the outer surface of the armor layer in an extruding mode.

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 insulated low-voltage cable, comprising:

the cross section of the reinforced core is Y-shaped;

the wrapping layer is wrapped on the outer side wall of the reinforcing core;

the conductive units are respectively positioned in three cavities surrounded by the reinforcing core and the wrapping layer;

the heat absorbing strips are arranged on the three V-shaped edges of the reinforcing core in a centrosymmetric manner;

the filling strips are arranged in one-to-one correspondence with the conductive units;

the outer insulating layer is coated on the outer side wall of the wrapping layer;

the armor layer is coated on the outer side wall of the outer insulating layer;

the outer sheath is coated on the outer side wall of the armor layer;

the filling strips are elastic filling strips, and a plurality of elastic filling strips are respectively filled in three cavities formed by the wrapping layer and the reinforcing core;

the heat absorbing strip comprises a coating structure, a hollow cavity is formed inside the coating structure, the hollow cavity of the coating structure is used for containing and filling heat absorbing media, and the hollow cavity of each heat absorbing strip is independently arranged.

2. An insulated low voltage cable according to claim 1, characterized in that the coating structure is a thin-walled structure with a wall thickness of 0.2-0.5 mm.

3. An insulated low voltage cable according to claim 1, wherein the resilient filler strip is a thermally conductive silicone rubber filler strip.

4. An insulated low voltage cable according to claim 1, wherein the armouring layer is a steel wire armouring layer.

5. The insulated low-voltage cable according to any one of claims 1 to 4, wherein the conductive unit comprises a wire core, an inner shielding layer, an inner insulating layer, an outer shielding layer and a lubricating layer which are arranged in sequence from inside to outside.

6. An insulated low voltage cable according to claim 5, characterized in that the lubricating layer is a polytetrafluoroethylene layer.

7. The insulated low-voltage cable according to claim 5, wherein the inner shield layer and the outer shield both use semiconductive nylon tapes.

8. An insulated low voltage cable according to claim 1, characterized in that the outer insulation layer is a polyethylene layer.

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