Environment-friendly high-strength power cable and production equipment thereof

Abstract

The invention relates to the field of cables, in particular to an environment-friendly high-strength power cable and production equipment thereof.The environment-friendly high-strength power cable comprises a plurality of conductors, insulating layers wrap the conductors, a protective layer is jointly arranged outside the conductors, the number of the conductors is an even number larger than or equal to 4, and deformation supporting pieces are arranged among the conductors; the overall cross section of the deformation supporting piece is polygonal, a deformation cavity is formed in the deformation supporting piece, outer protrusions with the number the same as that of the conductors are arranged on the outer surface of the deformation supporting piece, inner protrusions with the number and positions matched with those of the outer protrusions are arranged on the inner surface of the deformation supporting piece, and the outer protrusions and the conductors are arranged intermittently; according to the invention, the cable deforms and becomes flat when bearing pressure, so that the inner bulges distributed up and down approach each other towards the interior of the deformation cavity until the end parts are in contact, and the pressure borne by the sheath is transmitted through the upper outer bulge, the upper inner bulge, the lower inner bulge and the lower outer bulge in sequence, and is not transmitted through the conductor, so that the conductor is protected.

Description

Technical Field

[0001] The present invention relates to the field of cables, and in particular to an environmentally friendly high-strength power cable and production equipment thereof. Background Art

[0002] Cable is a device for transmitting electric energy or signals, usually composed of a conductor, an insulating layer, a filling layer and a sheath. Some cables may have an armor layer added to increase their compressive strength, and a shielding layer may be added to reduce electromagnetic interference and ensure the stability of signal transmission.

[0003] In order to increase the compressive strength of existing cables, improvements are usually made to the filling layer and the armor layer, such as using steel strips, elastic strips, buffer strips, foam buffer layers or honeycomb pressure-resistant layers to closely combine, and using the material's ability to resist bending deformation to improve the compressive effect, such as publication numbers: CN118136308B, CN117877790B; However, when the cable is under pressure, the pressure will be directly transmitted to the conductor and insulation layer through the filling layer, sheath and armor layer. As part of the force transmission, the conductor and insulation layer will be damaged when they are under a certain pressure.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0005] The purpose of the present invention is to design a cable in which, when under pressure, the pressure is not directly transmitted to the conductor and the insulating layer through the filling layer, the sheath and the armor layer, thereby reducing the force borne by the conductor and the insulating layer, thereby improving the strength of the cable and solving the above-mentioned deficiencies in the technology.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: an environmentally friendly high-strength power cable, comprising a plurality of conductors, the conductors are wrapped with an insulating layer, the plurality of conductors are provided with a sheath together, the number of the conductors is set to an even number ≥ 4, a deformable support is provided between the plurality of conductors, the cross section of the deformable support is polygonal as a whole, a deformable cavity is provided inside the deformable support, the outer surface of the deformable support has external protrusions of the same number as the number of the conductors, the inner surface of the deformable support has internal protrusions of which the number and position match the external protrusions, and the external protrusions and the conductors are arranged intermittently; When the sheath is under pressure, the deformation support becomes flat and deformed, allowing the upper and lower inner protrusions to approach each other in the deformation cavity until the ends touch, so that the pressure on the sheath is transmitted in sequence through the upper outer protrusion, the upper inner protrusion, the lower inner protrusion and the lower outer protrusion without transmitting force through the conductor.

[0007] Preferably, the deformation support member includes connecting pieces, and an outer convex block and an inner convex block fixedly connected between the two connecting pieces. The conductors and the outer convex blocks are arranged intermittently in a ring shape, and both the connecting pieces and the outer convex blocks are attached to the outer peripheral surface of the insulating layer.

[0008] Preferably, the maximum diameter of the circle formed by the annular array distribution of the plurality of outer convex blocks is greater than the maximum diameter of the circle formed by the annular array distribution of the plurality of insulating layers.

[0009] Preferably, the minimum diameter of the circle formed by the annular array distribution of the plurality of inner convex blocks is smaller than the minimum diameter of the circle formed by the annular array distribution of the plurality of connecting pieces.

[0010] Preferably, the distance between the ends of the outer convex block and the inner convex block fixedly connected to each other is greater than the outer diameter of the insulating layer.

[0011] Preferably, a filling layer is filled between the insulating layer, the outer convex block and the protective layer.

[0012] Preferably, both the filling layer and the deformation support member are rubber material components.

[0013] Preferably, one end of the cross-section of the outer convex block is circular and the other end is strip-shaped. Both sides of the strip have inner concave arcs with the same size as the outer diameter of the insulating layer, and the inner concave arcs are tangent to the circular shape at the end of the outer convex block.

[0014] Preferably, the cross-sectional shape of the end of the inner convex block is an isosceles trapezoid, and both sides of the bottom of the isosceles trapezoid have rounded corners.

[0015] In a second aspect, the present invention also provides a production device for producing an environment-friendly high-strength power cable, including a first extruder for producing the deformation support member, a guiding roller disc for guiding the conductor with the insulating layer between the two outer convex blocks, a second extruder for forming the filling layer outside the insulating layer and the deformation support member, and a third extruder for forming the protective layer outside the filling layer.

[0016] In the above technical solution, the technical effects and advantages provided by the present invention are as follows: When the cable is under pressure, the present invention deforms and flattens, so that the upper and lower inner protrusions approach each other in the deformation cavity until the ends contact each other. The pressure received by the protective layer is transmitted through the upper outer protrusion, the upper inner protrusion, the lower inner protrusion and the lower outer protrusion in sequence, and does not pass through the conductor to transmit force, so as to protect the conductor. The present invention allows the upper and lower inner convex blocks to contact each other by deforming and flattening the cable when it is under pressure, so that the inner convex block and the outer convex block can protect the conductor before they are crushed due to the pressure. Compared with the prior art in which the filling layer is deformed to press the pressure of the conductor, the pressure required to crush the inner convex block and the outer convex block is greater, which relatively improves the strength of the cable. At the same time, the present invention can set the outer convex block and the inner convex block to be made of metal material, further increasing the pressure required for crushing, thereby further improving the compressive strength; The present invention changes the prior art that when the cable is under pressure, the deformation resistance of the materials such as the sheath and the filling layer is used to reduce the direct pressure on the conductor, thereby providing support strength; the invention changes the method to use the deformation of the material itself to change the conduction of force, so that the pressure does not directly press the conductor, but is transmitted to the deformation support, the sheath and the filling layer, thereby providing support. When the upper and lower inner protrusions of the present invention are in contact, the inner and outer protrusions form an I-shaped vertical support component, which has the same supporting strength as rubber material components of the same thickness. At the same time, the two protrusions are isosceles trapezoids, providing stable plane contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional view of the present invention; Figure 3 is a side view of the present invention; Figure 4 A three-dimensional diagram of a deformable support member of the present invention; Figure 5 It is a three-dimensional diagram of the filling layer of the present invention; Figure 6 It is a schematic diagram of the production state of the present invention; Figure 7 It is a schematic diagram of the production equipment of the present invention.

[0019] Description of reference numerals: 1. Conductor; 2. Insulation layer; 3. Sheath; 4. Deformable support member; 4a. Connecting piece; 4b. External protrusion; 4c. Internal protrusion; 5. Deformable cavity; 6. External protrusion; 7. Internal protrusion; 8. Filling layer; 9. First extruder; 10. Guide roller; 11. Second extruder; 12. Third extruder. DETAILED DESCRIPTION

[0020] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0021] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0022] The present invention provides an environment-friendly high-strength power cable as Figure 1-7 shown, including an even number of conductors 1 greater than or equal to 4. An insulating layer 2 is wrapped outside the conductors 1. These conductors 1 are distributed in a circular array. A convex block 4b is attached between every two adjacent insulating layers 2. There is a connecting piece 4a attached to the outer surface of the insulating layer 2 between two adjacent convex blocks 4b. At the same time, there is an inner convex block 4c at the end of two adjacent convex blocks 4b. The convex block 4b, the connecting piece 4a and the inner convex block 4c form a deformation support member 4. The space between multiple inner convex blocks 4c and the connecting piece 4a forms a deformation cavity 5. At this time, the overall cross-sectional shape of the deformation support member 4 is a polygon, and this polygon depends on the number of conductors 1. And multiple outer protrusions 6 higher than the insulating layer 2 are formed on the outer surface of the deformation support member 4, and multiple inner protrusions 7 are formed on the inner surface of the deformation support member 4. And a filling layer 8 is coated outside the convex block 4b and the insulating layer 2. The filling layer 8 is used to transmit force, and limit the conductor 1 between two convex blocks 4b, and at the same time has a certain compressive effect. A protective layer 3 is coated outside the filling layer 8. The protective layer 3 is used to protect the surface of the cable; When the cable bears weight and is compressed, the pressure will be first transmitted to the upper protective layer 3 above. The upper protective layer 3 then transmits the force to the filling layer 8, and the filling layer 8 transmits it to the deformation support member 4. At this time, the whole cable is flattened. The inner convex block 4c and the conductor 1 at the top of the deformation support member 4 will move into the deformation cavity 5. The upper convex block 4b will become perpendicular to the ground. When the end of the lower inner convex block 4c contacts the end of the upper inner convex block 4c, the upper inner convex block 4c will no longer be able to descend. At this time, the filling layer 8 will transmit the force to the upper convex block 4b above. The upper convex block 4b transmits the force to the upper inner convex block 4c above. The upper inner convex block 4c transmits the force to the lower inner convex block 4c. The lower inner convex block 4c transmits the force to the lower convex block 4b below. The lower convex block 4b then transmits the force to the lower protective layer 3 below, so as to bypass most of the pressure around the conductor 1 to protect the conductor 1; Meanwhile, to ensure that most of the pressure is not transmitted through the conductor 1, we increase the height of the outer bump 4b so that the maximum diameter A of the circle formed by the outer bump 4b is greater than the maximum diameter B of the circle formed by several insulating layers 2. For example, the size ratio is A:B = 1.1:1 - 1.2:1. To prevent the upper and lower inner bumps 4c from not coming into contact yet while the upper and lower connecting pieces 4a come into contact first, we increase the height of the inner bump 4c so that the minimum diameter C of the circle formed by the inner bump 4c is less than the minimum diameter D of the circle formed by the connecting block, with C:D = 1:1.1 - 1:1.2; Meanwhile, to ensure the close contact between the insulating layer 2 and the outer bump 4b, we set the outer bump 4b such that the cross-section at one end is circular and the other end is strip-shaped. The two sides of the strip have concave arcs with the same outer diameter size as the insulating layer 2, and the concave arcs are tangent to the circle at the end of the outer bump 4b; Here, the deformation support member 4 is integrally made of rubber. It is also possible to set the outer bump 4b and the inner bump 4c in the support member as an integrally formed member made of metal material, and keep the connecting piece 4a made of rubber material to further improve the compressive capacity by using the inner bump 4c and the outer bump 4b made of metal material; Combined with an environment-friendly high-strength power cable, the present invention also provides a production device for producing the environment-friendly high-strength power cable. The usage method includes a first extruder 9 for producing the deformation support member 4, a guide roller disc 10 for guiding the conductor 1 with the insulating layer 2 between the two outer bumps 4b, a second extruder 11 for forming the filling layer 8 outside the insulating layer 2 and the deformation support member 4, and a third extruder 12 for forming the protective layer 3 outside the filling layer 8; We first use the first extruder 9 to produce the deformation support member 4, and then extrude the conductor 1 wrapped with the insulating layer 2 onto the deformation support member 4 through the guide roller disc and into the second extruder 11, so as to form the filling layer 8 to closely fit the conductor 1 and the deformation support member 4. Then, these three are processed by the third extruder 12 to form a protective layer 3 outside the filling layer 8.

[0023] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible on the premise of substantially not deviating from the novel teachings and advantages of the subject matter described in this application (for example, changes in the sizes, scales, structures, shapes and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, colors, orientations, etc.).

Claims

1. An environment-friendly high-strength power cable, comprising a plurality of conductors (1), an insulating layer (2) is wrapped outside the conductors (1), and a sheath (3) is commonly provided outside the plurality of conductors (1), and is characterized in that: The number of the conductors (1) is set to an even number ≥ 4. There is a deformation support member (4) between multiple conductors (1). The cross-section of the deformation support member (4) is integrally polygonal. There is a deformation cavity (5) inside the deformation support member (4). There are outer protrusions (6) on the outer surface of the deformation support member (4) with the same number as the conductors (1). There are inner protrusions (7) on the inner surface of the deformation support member (4) with the same number and positions matching those of the outer protrusions (6). The outer protrusions (6) and the conductors (1) are arranged intermittently. When the sheath (3) is pressed, the deformation support member (4) is flattened and deformed, so that the upper and lower inner protrusions (7) approach each other towards the deformation cavity (5) until their ends contact. The pressure received by the sheath (3) is transmitted successively through the upper outer protrusion (6), the upper inner protrusion (7), the lower inner protrusion (7), and the lower outer protrusion (6), without transmitting force through the conductor (1).

2. An environment-friendly high-strength power cable according to claim 1, characterized in that: The deformation support member (4) includes connecting pieces (4a), and outer convex blocks (4b) and inner convex blocks (4c) fixedly connected between two connecting pieces (4a). The conductors (1) and the outer convex blocks (4b) are arranged intermittently in a ring. The connecting pieces (4a) and the outer convex blocks (4b) are both attached to the outer peripheral surface of the insulating layer (2).

3. An environment-friendly high-strength power cable according to claim 2, characterized in that: The maximum diameter of the circle formed by the multiple outer convex blocks (4b) arranged in a circular array is larger than the maximum diameter of the circle formed by the multiple insulating layers (2) arranged in a circular array.

4. An environment-friendly high-strength power cable according to claim 2, characterized in that: The minimum diameter of the circle formed by the multiple inner convex blocks (4c) arranged in a circular array is smaller than the minimum diameter of the circle formed by the multiple connecting pieces (4a) arranged in a circular array.

5. An environment-friendly high-strength power cable according to claim 2, wherein: The distance between the ends of the outer convex block (4b) and the inner convex block (4c) fixedly connected to each other is larger than the outer diameter of the insulating layer (2).

6. An environment-friendly high-strength power cable according to claim 2, characterized in that: There is a filling layer (8) filled between the insulating layer (2), the outer convex block (4b), and the sheath (3).

7. An environment-friendly high-strength power cable according to claim 6, characterized in that: Both the filling layer (8) and the deformation support member (4) are rubber material components.

8. An environment-friendly high-strength power cable according to claim 2, characterized in that: One end of the cross-section of the outer convex block (4b) is circular, and the other end is strip-shaped. There are inner concave arcs with the same outer diameter size as the insulating layer (2) on both sides of the strip shape. The inner concave arcs are tangent to the circular shape at the end of the outer convex block (4b).

9. An environment-friendly high-strength power cable according to claim 2, wherein: The cross-sectional shape of the end of the inner convex block (4c) is an isosceles trapezoid, and there are rounded corners on both sides of the bottom of the isosceles trapezoid.

10. A production device for producing the environment-friendly high-strength power cable according to any one of claims 1-9, characterized in that: It includes a first extruder (9) for producing the deformation support member (4), a guiding roller disc (10) for guiding the conductor (1) with the insulating layer (2) between two outer convex blocks (4b), a second extruder (11) for forming the filling layer (8) outside the insulating layer (2) and the deformation support member (4), and a third extruder (12) for forming the sheath (3) outside the filling layer (8).

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