CN220155260U - Power generation fan connecting cable - Google Patents

Abstract

The utility model relates to the technical field of wires and cables, in particular to a power generation fan connecting cable, which comprises: an elastic core strip; the three conductors are stranded on the outer side of the elastic core strip around the central axis of the elastic core strip; three filling strips are filled at the outer sides of two adjacent conductors and are wrapped and fixed by wrapping belts to form a cable core with a circular section; the inner sheath is extruded and wrapped on the outer side of the wrapping belt; and the braiding layer is coated on the outer wall of the inner sheath. According to the utility model, the elastic core strips are arranged between the conductors, the steel wire rope is arranged in the center of the elastic core strips, the steel wire rope in the center plays a role in bearing and pulling, particularly, when the cable swings, each conductor can be prevented from being subjected to excessive tensile stress, the elastic core strips play a role in buffering between the conductors, when the cable swings in a twisting mode, the twisting tightness of the conductors changes, and after the elastic core strips are pressed and deformed, the extrusion stress between the conductors is reduced, so that the cable has higher tensile resistance and torsion resistance.

Description

Power generation fan connecting cable

Technical Field

The utility model relates to the technical field of wires and cables, in particular to a power generation fan connecting cable.

Background

The power generation fan is generally connected with a medium-voltage power cable for power transmission, the cable is generally arranged in a tower barrel of the power generation fan and rotates along with the rotation of the fan, and in the rotation process, the cable frequently swings and twists, so that the requirements on the tensile and torsion resistance of the cable are high.

In general, a steel wire is arranged in the cable as a main bearing unit for bearing tensile force, and is usually arranged in the central position of the cable, but when the cable is twisted, twisting force of the conductors is changed, which can lead to fatigue of the conductors, and in order to overcome the twisting force, a scheme of arranging the steel wire in the periphery of the conductors, such as an armor layer/a braiding layer, is adopted, but when the cable is twisted, the steel wire is tightly bound, and still causes larger radial pressure to the conductors in the inner layer, which can lead to deformation of the cable core, so that the torsion resistance of the cable still needs to be improved.

Disclosure of Invention

According to a first aspect of the object of the present utility model, there is provided a power generation fan connection cable comprising:

an elastic core strip;

the three conductors are stranded on the outer side of the elastic core strip around the central axis of the elastic core strip;

three filling strips are filled at the outer sides of two adjacent conductors and are wrapped and fixed by wrapping belts to form a cable core with a circular section;

the inner sheath is extruded and wrapped on the outer side of the wrapping belt;

the braiding layer is coated on the outer wall of the inner sheath;

the outer sheath is extruded and wrapped on the outer side of the braiding layer;

the elastic core strip is configured to have three cambered surfaces, and the three cambered surfaces are respectively attached to the outer walls of the three conductors, so that the spacing between the three conductors is changed according to the deformation of the elastic core strip;

and a steel wire rope is arranged in the center of the elastic core strip.

Preferably, the conductor comprises a copper guide core, a conductor shielding layer, an insulating shielding layer and a semiconductor braiding layer which are distributed from inside to outside, wherein the copper guide core comprises a fine copper wire stranding structure.

Preferably, the insulating layer comprises a high density polyethylene insulating layer.

Preferably, the hardness of the elastic core strip is lower than the hardness of the insulating layer.

Preferably, the elastic core strip comprises a silica gel strip, a rubber strip or a PP strip.

Preferably, the filler strip comprises a PP strip of prefabricated shape, and the filler strip is provided with:

a first surface in contact with the elastic core strip;

a second surface and a third surface in contact with the conductor;

a fourth surface in contact with the wrapping tape;

the second surface and the third surface are concave cambered surfaces, and the fourth surface is a convex cambered surface.

Preferably, the wrapping tape has a wrapping overlap of greater than 50%.

Preferably, the braiding layer comprises an aramid yarn braiding layer.

Compared with the prior art, the elastic core strip is arranged between the conductors, the steel wire rope is arranged in the center of the elastic core strip, the steel wire rope in the center plays a role in bearing tension, particularly, when the cable swings, the elastic core strip plays a role in buffering between the conductors, when the cable swings in a twisting mode, the conductor is twisted and the tightness is changed, and after the elastic core strip is deformed under compression, the extrusion stress between the conductors is reduced, so that the cable has higher tensile resistance and torsion resistance.

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 utility model will now be described, by way of example, with reference to the accompanying drawings.

Fig. 1 is a perspective view of a power generation fan connection cable according to the present utility model.

Fig. 2 is a schematic cross-sectional view of a power generation fan connection cable according to the present utility model.

Detailed Description

For a better understanding of the technical content of the present utility model, specific examples are set forth below, along with the accompanying drawings.

Referring to fig. 1-2, the power generation fan connection cable according to an exemplary embodiment of the present utility model includes a cable core formed by an elastic core bar 2, a conductor 3 and a filler bar 4, and a wrapping layer and an insulating layer wrapping the cable core.

In order to increase the torsion resistance of the cable, a buffer structure is arranged between the conductors 3 (three conductors are illustrated in the illustrated example), when the cable swings and twists, the deformation of the buffer structure is utilized to reduce the twisting extrusion stress between the conductors 3, and meanwhile, the steel wire rope 1 and the braiding layer 7 in the elastic core strip 2 play a bearing role in the axial direction, so that the tensile property of the cable is ensured.

In a specific embodiment, three conductors 3 are stranded on the outer sides of the elastic core strips 2 around the central axis of the elastic core strips 2, three filling strips 4 are filled on the outer sides of two adjacent conductors 3, a cable core with a circular section is formed by wrapping and fixing around a wrapping belt 5, and a steel wire rope 1 is arranged in the center of the elastic core strips 2.

Alternatively, the wire rope 1 is formed by twisting 7 thin wires, the diameter of which is 1.0 + -0.1 mm.

As shown in connection with fig. 1-2, the elastic core strip 2 is configured to have three cambered surfaces, which are respectively fitted with the outer walls of the three conductors 3.

Thus, when the cable is twisted, the three conductors 3 are twisted more tightly, the elastic core strip 2 is compressed and deformed, so that the intervals between the three conductors 3 are close to each other, and at the moment, the extrusion force between the conductors 3 and the tensile stress of the copper guide core 31 are reduced due to the deformation of the elastic core strip 2 in the area where the original stress is concentrated, so that the cable core has better torsion resistance.

In an alternative embodiment, the conductor 3 comprises a copper core 31, a conductor shielding layer 32, an insulating layer 33, an insulating shielding layer 34 and a semiconductor braid 35 distributed from inside to outside, wherein the copper core 31 comprises a fine copper wire stranded structure, for example a 1+6+12 standard stranded structure is used.

The semiconductor braid 35 is formed by braiding semiconductor conductive fibers, the braiding angle is 45 degrees, and the braiding coverage rate is more than 70%.

Further, the conductor shielding layer 32, the insulating layer 33 and the insulating shielding layer 34 are extruded by adopting a three-layer co-extrusion process, and the conductor shielding layer 32 and the insulating shielding layer 34 are formed by extrusion of semiconductive rubber.

Preferably, the insulating layer 33 comprises a high density polyethylene insulating layer.

In an alternative embodiment, the hardness of the elastic core strip 2 is lower than the hardness of the insulating layer 33 in order to avoid deformation of the insulating layer 33 during extrusion. Alternatively, the elastic core strip 2 comprises a strip of silicone rubber, rubber or PP.

As shown in connection with fig. 2, the filler strip 4 comprises PP strips of prefabricated shape, the filler strip 4 being provided with:

a first surface in contact with the elastic core strip 2;

a second surface and a third surface in contact with the conductor 3;

a fourth surface in contact with the wrapping tape 5;

the second surface and the third surface are concave cambered surfaces, and the fourth surface is a convex cambered surface.

In this way, when the filler rod 4 is filled between the two conductors 3, the core structure formed by wrapping can be more round, and at the same time, the filler rod 4 also has elasticity, and can deform when the conductors 3 are twisted.

Optionally, the wrapping belt 5 is a polyester belt, the wrapping cover rate of the polyester belt is more than 50%, and the cable core can be ensured to be tightly wrapped through the larger cover rate, so that the cable core is not easy to deform after frequent torsion.

Further, the inner sheath 6 is extruded and wrapped on the outer side of the wrapping belt 5, the braiding layer 7 is wrapped on the outer wall of the inner sheath 6, and the outer sheath 8 is extruded and wrapped on the outer side of the braiding layer 7.

The inner sheath 6 and the outer sheath 8 are formed by extrusion of chlorinated polyethylene materials, in order to increase the overall tensile property of the cable, particularly the tensile property of the outer sheath part, the braiding layer 7 is an aramid yarn braiding layer, the aramid yarn braiding layer is formed by braiding a first strand of aramid yarn and a second strand of aramid yarn according to a vertical angle, and the included angle between each strand of aramid yarn and the axis of the cable is 45 degrees.

As an optional example, the power generation fan connection cable provided by the utility model has the following basic preparation process:

firstly, preparing an elastic core strip 2, a conductor 3 and a filling strip 4; the steel wire rope 1 is formed by twisting 7 thin steel wires by using twisting equipment, the pitch diameter ratio is larger than 14, the outer wall of the steel wire rope 1 is extruded with an elastic core strip 2, and the die opening of the extruder is set to be the same as the section shape of the elastic core strip 2; the conductor 3 is twisted into a conductor core structure by 19 fine copper wires, the pitch diameter ratio is 8-10, three layers of extrusion conductor shielding layers 32, insulating layers 33 and insulating shielding layers 34 are co-extruded on the outer wall of the conductor core formed by twisting by using an extruder, and then a semiconductor weaving layer 35 is formed on the surface of the extruded insulating shielding layers 34 by using a braiding machine to form the conductor 3; the filling strip 4 is formed by extrusion of PP particles, and the die shape of the filling strip is the same as the section shape of the filling strip 4;

then, twisting the prepared elastic core strip 2, the three conductors 3 and the filling strip 4 together to form a cable, and wrapping a layer of wrapping tape 5 on the outer wall of the filling strip 4 to tightly fasten the cable core structure;

finally, the surface of the wrapping belt 5 is extruded with chlorinated polyethylene material to form an inner sheath 6, the surface of the inner sheath 6 is woven with a braiding machine to form an aramid yarn braiding layer, the braiding angle of the aramid yarn is 45 degrees, and then the surface of the braided aramid yarn braiding layer is extruded with an outer sheath 8, and the extrusion materials of the outer sheath 8 and the inner sheath 6 are the same to form the cable.

According to the utility model, the elastic core strips are arranged between the conductors, the steel wire rope is arranged in the center of the elastic core strips, the steel wire rope in the center plays a role in bearing and pulling, particularly, when the cable swings, the excessive tensile stress of each conductor can be avoided, the elastic core strips play a role in buffering between the conductors, when the cable swings in a twisting mode, the twisting tightness of the conductors changes, and after the elastic core strips are deformed under compression, the extrusion stress between the conductors is reduced, so that the cable has higher tensile resistance and torsion resistance.

While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present utility model. Accordingly, the scope of the utility model is defined by the appended claims.

Claims (8)

1. A power generation fan connection cable, comprising:

an elastic core strip (2);

three conductors (3) are stranded on the outer side of the elastic core strip (2) around the central axis of the elastic core strip (2);

three filling strips (4) are filled outside two adjacent conductors (3), and are wrapped and fixed by wrapping belts (5) to form a cable core with a circular section;

an inner sheath (6) which is extruded and wrapped on the outer side of the wrapping belt (5);

the braiding layer (7) is coated on the outer wall of the inner sheath (6);

an outer sheath (8) extruded outside the braiding layer (7);

the elastic core strip (2) is configured to have three cambered surfaces, and the three cambered surfaces are respectively attached to the outer walls of the three conductors (3), so that the spacing between the three conductors (3) can be changed according to the deformation of the elastic core strip (2);

the center of the elastic core strip (2) is provided with a steel wire rope (1).

2. The power generation fan connection cable according to claim 1, characterized in that the conductor (3) comprises a copper conductor core (31), a conductor shielding layer (32), an insulating layer (33), an insulating shielding layer (34) and a semiconductor braid (35) distributed from inside to outside, the copper conductor core (31) comprising a fine copper wire stranded structure.

3. The power generating fan connection cable according to claim 2, characterized in that the insulation layer (33) comprises a high density polyethylene insulation layer.

4. A power generating fan connection cable according to claim 3, characterized in that the hardness of the elastic core strip (2) is lower than the hardness of the insulating layer (33).

5. The power generating fan connection cable according to claim 1, characterized in that the elastic core strip (2) comprises a strip of silicone rubber, rubber or PP.

6. The power generating fan connection cable according to claim 1, characterized in that the filler strip (4) comprises PP strips of prefabricated shape, the filler strip (4) being provided with:

a first surface in contact with the elastic core strip (2);

a second surface and a third surface in contact with the conductor (3);

a fourth surface in contact with the wrapping tape (5);

the second surface and the third surface are concave cambered surfaces, and the fourth surface is a convex cambered surface.

7. The power generation fan connection cable according to claim 1, characterized in that the wrap-around covering rate of the wrap-around strap (5) is greater than 50%.

8. The power generating fan connection cable according to claim 1, characterized in that the braid (7) comprises an aramid yarn braid.